repo_id stringlengths 22 103 | file_path stringlengths 41 147 | content stringlengths 181 193k | __index_level_0__ int64 0 0 |
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data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/fundamentals/index.md | ---
title: Performance fundamentals
slug: Web/Performance/Fundamentals
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
Performance means efficiency. In the context of Open Web Apps, this document explains in general what performance is, how the browser platform helps improve it, and what tools and ... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/lazy_loading/index.md | ---
title: Lazy loading
slug: Web/Performance/Lazy_loading
page-type: guide
spec-urls: https://html.spec.whatwg.org/multipage/#lazy-loading-attributes
---
{{QuickLinksWithSubPages("Web/Performance")}}
**Lazy loading** is a strategy to identify resources as non-blocking (non-critical) and load these only when needed. ... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/navigation_and_resource_timings/index.md | ---
title: Navigation and resource timings
slug: Web/Performance/Navigation_and_resource_timings
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
**Navigation timings** are metrics measuring a browser's document navigation events. **Resource timings** are detailed network timing measurements regardi... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/rum-vs-synthetic/index.md | ---
title: "Performance Monitoring: RUM vs. synthetic monitoring"
slug: Web/Performance/Rum-vs-Synthetic
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
**Synthetic monitoring** and **real user monitoring (RUM)** are two approaches for monitoring and providing insight into web performance. RUM and ... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/critical_rendering_path/index.md | ---
title: Critical rendering path
slug: Web/Performance/Critical_rendering_path
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
The Critical Rendering Path is the sequence of steps the browser goes through to convert the HTML, CSS, and JavaScript into pixels on the screen. Optimizing the critical ... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/optimizing_startup_performance/index.md | ---
title: Optimizing startup performance
slug: Web/Performance/Optimizing_startup_performance
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
Improving your startup performance is often one of the highest value performance optimizations that can be made. How long does your app take to start up? Do... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/dns-prefetch/index.md | ---
title: Using dns-prefetch
slug: Web/Performance/dns-prefetch
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
**`DNS-prefetch`** is an attempt to resolve domain names before resources get requested. This could be a file loaded later or link target a user tries to follow.
## Why use dns-prefetch... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/css_javascript_animation_performance/index.md | ---
title: CSS and JavaScript animation performance
slug: Web/Performance/CSS_JavaScript_animation_performance
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
Animations are critical for a pleasurable user experience on many applications. There are many ways to implement web animations, such as CSS... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/performance_budgets/index.md | ---
title: Performance budgets
slug: Web/Performance/Performance_budgets
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
A performance budget is a limit to prevent regressions. It can apply to a file, a file type, all files loaded on a page, a specific metric (e.g. [Time to Interactive](/en-US/docs... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/understanding_latency/index.md | ---
title: Understanding latency
slug: Web/Performance/Understanding_latency
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
**Latency** is the time it takes for a packet of data to travel from source to a destination. In terms of performance optimization, it's important to optimize to reduce cause... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/how_browsers_work/index.md | ---
title: "Populating the page: how browsers work"
slug: Web/Performance/How_browsers_work
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
Users want web experiences with content that is fast to load and smooth to interact with. Therefore, a developer should strive to achieve these two goals.
To ... | 0 |
data/mdn-content/files/en-us/web/performance | data/mdn-content/files/en-us/web/performance/speculative_loading/index.md | ---
title: Speculative loading
slug: Web/Performance/Speculative_loading
page-type: guide
---
{{QuickLinksWithSubPages("Web/Performance")}}
**Speculative loading** refers to the practice of performing navigation actions (such as DNS fetching, fetching resources, or rendering documents) before the associated pages are... | 0 |
data/mdn-content/files/en-us/web | data/mdn-content/files/en-us/web/xslt/index.md | ---
title: "XSLT: Extensible Stylesheet Language Transformations"
slug: Web/XSLT
page-type: landing-page
---
{{XsltSidebar}}
**Extensible Stylesheet Language Transformations (XSLT)** is an [XML](/en-US/docs/Web/XML/XML_introduction)-based language used, in conjunction with specialized processing software, for the tra... | 0 |
data/mdn-content/files/en-us/web/xslt | data/mdn-content/files/en-us/web/xslt/element/index.md | ---
title: XSLT elements reference
slug: Web/XSLT/Element
page-type: landing-page
---
{{XsltSidebar}}
There are two types of elements discussed here: top-level elements and instructions. A top-level element must appear as the child of either `<xsl:stylesheet>` or `<xsl:transform>`. An instruction, on the other hand, ... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/attribute-set/index.md | ---
title: <xsl:attribute-set>
slug: Web/XSLT/Element/attribute-set
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:attribute-set>` element creates a named set of attributes, which can then be applied as whole to the output document, in a manner similar to named styles in CSS.
### Syntax
```xml
<xsl:attribute... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/strip-space/index.md | ---
title: <xsl:strip-space>
slug: Web/XSLT/Element/strip-space
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:strip-space>` element defines the elements in the source document for which whitespace should be removed.
### Syntax
```xml
<xsl:strip-space elements=LIST-OF-ELEMENT-NAMES />
```
### Required Attri... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/processing-instruction/index.md | ---
title: <xsl:processing-instruction>
slug: Web/XSLT/Element/processing-instruction
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:processing-instruction>` element writes a processing instruction to the output document.
### Syntax
`<xsl:processing-instruction name=NAME> TEMPLATE </xsl:processing-instructio... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/stylesheet/index.md | ---
title: <xsl:stylesheet>
slug: Web/XSLT/Element/stylesheet
page-type: xslt-element
spec-urls: https://www.w3.org/TR/xslt-30/#stylesheet-element
---
{{XsltSidebar}}
The `<xsl:stylesheet>` element (or the equivalent `<xsl:transform>` element) is the outermost element of a stylesheet.
### Namespace Declaration
A ps... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/if/index.md | ---
title: <xsl:if>
slug: Web/XSLT/Element/if
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:if>` element contains a test attribute and a template. If the test evaluates to true, the template is processed. In this it is similar to an if statement in other languages. To achieve the functionality of an if-then-e... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/preserve-space/index.md | ---
title: <xsl:preserve-space>
slug: Web/XSLT/Element/preserve-space
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:preserve-space>` element defines the elements in the source document for which whitespace should be preserved. If there is more than one element, separate the names with a whitespace character. ... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/variable/index.md | ---
title: <xsl:variable>
slug: Web/XSLT/Element/variable
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:variable>` element declares a global or local variable in a stylesheet and gives it a value. Because XSLT permits no side-effects, once the value of the variable has been established, it remains the same un... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/element/index.md | ---
title: <xsl:element>
slug: Web/XSLT/Element/element
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:element>` element creates an element in the output document.
### Syntax
```xml
<xsl:element name=NAME namespace=URI use-attribute-sets=LIST-OF-NAMES >
TEMPLATE
</xsl:element>
```
### Required Attributes
... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/when/index.md | ---
title: <xsl:when>
slug: Web/XSLT/Element/when
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:when>` element always appears within an `<xsl:choose>` element, acting like a case statement.
### Syntax
```xml
<xsl:when test=EXPRESSION>
TEMPLATE
</xsl:when>
```
### Required Attributes
- `test`
- : Speci... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/template/index.md | ---
title: <xsl:template>
slug: Web/XSLT/Element/template
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:template>` element defines an output producing template. This element must have either the match attribute or the name attribute set.
### Syntax
```xml
<xsl:template
match=PATTERN
name=NAME
mode=NAM... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/include/index.md | ---
title: <xsl:include>
slug: Web/XSLT/Element/include
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:include>` element merges the contents of one stylesheet with another. Unlike the case of `<xsl:import>`, the contents of an included stylesheet have exactly the same precedence as the contents of the includin... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/transform/index.md | ---
title: <xsl:transform>
slug: Web/XSLT/Element/transform
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:transform>` element is exactly equivalent to the [`<xsl:stylesheet>`](/en-US/docs/Web/XSLT/Element/stylesheet) element.
### Gecko support
Supported.
| 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/import/index.md | ---
title: <xsl:import>
slug: Web/XSLT/Element/import
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:import>` element is a top-level element that serves to import the contents of one stylesheet into another stylesheet. Generally speaking, the contents of the imported stylesheet have a lower import precedence t... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/comment/index.md | ---
title: <xsl:comment>
slug: Web/XSLT/Element/comment
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:comment>` element writes a comment to the output document. It must include only text.
### Syntax
```xml
<xsl:comment>
TEMPLATE
</xsl:comment>
```
### Required Attributes
None.
### Optional Attributes
... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/output/index.md | ---
title: <xsl:output>
slug: Web/XSLT/Element/output
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:output>` element controls the characteristics of the output document. To function correctly in Netscape, this element, with the method attribute, must be used. As of 7.0, `method="text"` works as expected.
###... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/apply-templates/index.md | ---
title: <xsl:apply-templates>
slug: Web/XSLT/Element/apply-templates
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:apply-templates>` element selects a set of nodes in the input tree and instructs the processor to apply the proper templates to them.
### Syntax
```xml
<xsl:apply-templates select=EXPRESSION... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/namespace-alias/index.md | ---
title: <xsl:namespace-alias>
slug: Web/XSLT/Element/namespace-alias
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:namespace-alias>` element is a rarely used device that maps a namespace in the stylesheet to a different namespace in the output tree. The most common use for this element is in generating a s... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/copy-of/index.md | ---
title: <xsl:copy-of>
slug: Web/XSLT/Element/copy-of
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:copy-of>` element makes a deep copy (including descendant nodes) of whatever the select attribute specifies to the output document.
### Syntax
```xml
<xsl:copy-of select=EXPRESSION />
```
### Required Attr... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/apply-imports/index.md | ---
title: <xsl:apply-imports>
slug: Web/XSLT/Element/apply-imports
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:apply-imports>` element is fairly arcane, used mostly in complex stylesheets. Import precedence requires that template rules in main stylesheets have higher precedence than template rules in impor... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/text/index.md | ---
title: <xsl:text>
slug: Web/XSLT/Element/text
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:text>` element writes literal text to the output tree. It may contain `#PCDATA`, literal text, and entity references.
### Syntax
```xml
<xsl:text disable-output-escaping="yes" | "no">
TEXT
</xsl:text>
```
### ... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/number/index.md | ---
title: <xsl:number>
slug: Web/XSLT/Element/number
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:number>` element counts things sequentially. It can also be used to quickly format a number.
### Syntax
```xml
<xsl:number
count=EXPRESSION
level="single" | "multiple" | "any"
from=EXPRESSION
value=EX... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/message/index.md | ---
title: <xsl:message>
slug: Web/XSLT/Element/message
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:message>` element outputs a message (to the JavaScript Console in NS) and optionally terminates execution of the stylesheet. It can be useful for debugging.
### Syntax
```xml
<xsl:message terminate="yes" | ... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/value-of/index.md | ---
title: <xsl:value-of>
slug: Web/XSLT/Element/value-of
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:value-of>` element evaluates an XPath expression, converts it to a string, and writes that string to the result tree.
### Syntax
```xml
<xsl:value-of select=EXPRESSION disable-output-escaping="yes" | "no"... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/with-param/index.md | ---
title: <xsl:with-param>
slug: Web/XSLT/Element/with-param
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:with-param>` element sets the value of a parameter to be passed into a template.
### Syntax
```xml
<xsl:with-param name=NAME select=EXPRESSION>
TEMPLATE
</xsl:with-param>
```
### Required Attribute... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/decimal-format/index.md | ---
title: <xsl:decimal-format>
slug: Web/XSLT/Element/decimal-format
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:decimal-format>` element defines the characters and symbols that are to be used in converting numbers into strings using the `format-number( )` function.
### Syntax
```xml
<xsl:decimal-format
... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/otherwise/index.md | ---
title: <xsl:otherwise>
slug: Web/XSLT/Element/otherwise
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:otherwise>` element is used to define the action that should be taken when none of the `<xsl:when>` conditions apply. It is similar to the `else` or `default` case in other programming languages.
### Syn... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/fallback/index.md | ---
title: <xsl:fallback>
slug: Web/XSLT/Element/fallback
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:fallback>` element specifies what template to use if a given extension (or, eventually, newer version) element is not supported.
### Syntax
```xml
<xsl:fallback>
TEMPLATE
</xsl:fallback>
```
### Requir... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/key/index.md | ---
title: <xsl:key>
slug: Web/XSLT/Element/key
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:key>` element declares a named key which can be used elsewhere in the stylesheet with the `key( )` function.
### Syntax
```xml
<xsl:key name=NAME match=EXPRESSION
use=EXPRESSION />
```
### Required Attributes
-... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/for-each/index.md | ---
title: <xsl:for-each>
slug: Web/XSLT/Element/for-each
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:for-each>` element selects a set of nodes and processes each of them in the same way. It is often used to iterate through a set of nodes or to change the current node. If one or more `<xsl:sort>` elements a... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/param/index.md | ---
title: <xsl:param>
slug: Web/XSLT/Element/param
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:param>` element establishes a parameter by name and, optionally, a default value for that parameter. When used as a top-level element, the parameter is global. When used inside an `<xsl:template>` element, the pa... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/attribute/index.md | ---
title: <xsl:attribute>
slug: Web/XSLT/Element/attribute
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:attribute>` element creates an attribute in the output document, using any values that can be accessed from the stylesheet. The element must be defined before any other output document element inside the ... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/sort/index.md | ---
title: <xsl:sort>
slug: Web/XSLT/Element/sort
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:sort>` element defines a sort key for nodes selected by `<xsl:apply-templates>` or `<xsl:for-each>` and determines the order in which they are processed.
### Syntax
```xml
<xsl:sort
select=EXPRESSION
order="a... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/copy/index.md | ---
title: <xsl:copy>
slug: Web/XSLT/Element/copy
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:copy>` element transfers a shallow copy (the node and any associated namespace node) of the current node to the output document. It does not copy any children or attributes of the current node.
### Syntax
```xml
... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/choose/index.md | ---
title: <xsl:choose>
slug: Web/XSLT/Element/choose
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:choose>` element defines a choice among a number of alternatives. It behaves like a switch statement in procedural languages.
### Syntax
```xml
<xsl:choose>
<xsl:when test="[whatever to test1]"></xsl:when>
... | 0 |
data/mdn-content/files/en-us/web/xslt/element | data/mdn-content/files/en-us/web/xslt/element/call-template/index.md | ---
title: <xsl:call-template>
slug: Web/XSLT/Element/call-template
page-type: xslt-element
---
{{XsltSidebar}}
The `<xsl:call-template>` element invokes a named template.
### Syntax
```xml
<xsl:call-template name=NAME>
<xsl:with-param> [optional]
</xsl:call-template>
```
### Required Attribute
- `name`
- : S... | 0 |
data/mdn-content/files/en-us/web/xslt | data/mdn-content/files/en-us/web/xslt/common_errors/index.md | ---
title: Common XSLT Errors
slug: Web/XSLT/Common_errors
page-type: guide
---
{{XsltSidebar}}
### MIME types
Your server needs to send both the source and the stylesheet with a XML mime type, `text/xml` or `application/xml`. To find out the current type, load the file in Mozilla and look at the page info. Or use a... | 0 |
data/mdn-content/files/en-us/web/xslt | data/mdn-content/files/en-us/web/xslt/pi_parameters/index.md | ---
title: PI Parameters
slug: Web/XSLT/PI_Parameters
page-type: guide
---
{{XsltSidebar}}
### Overview
XSLT supports the concept of passing parameters to a stylesheet when executing it. This has been possible for a while when using the {{domxref("XSLTProcessor")}} in JavaScript. However when using an `<?xml-stylesh... | 0 |
data/mdn-content/files/en-us/web/xslt | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/index.md | ---
title: Transforming XML with XSLT
slug: Web/XSLT/Transforming_XML_with_XSLT
page-type: guide
---
{{XsltSidebar}}
## An Overview
[An Overview](/en-US/docs/Web/XSLT/Transforming_XML_with_XSLT/An_Overview)
The separation of content and presentation is a key design feature of [XML](/en-US/docs/Web/XML). The structu... | 0 |
data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/index.md | ---
title: The Netscape XSLT/XPath Reference
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference
page-type: landing-page
---
{{XsltSidebar}}
The following is an alphabetized and annotated list of the elements, axes, and functions from the W3C's 1.0 Recommendation for XSLT, as well as from the ... | 0 |
data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/ancestor/index.md | ---
title: ancestor
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/ancestor
page-type: xslt-axis
---
{{XsltSidebar}}
The ancestor axis indicates all the ancestors of the context node beginning with the parent node and traveling through to the root node.
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data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/parent/index.md | ---
title: parent
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/parent
page-type: xslt-axis
---
{{XsltSidebar}}
The parent axis indicates the single node that is the parent of the context node. It can be abbreviated as two periods (`..`).
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data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/ancestor-or-self/index.md | ---
title: ancestor-or-self
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/ancestor-or-self
page-type: xslt-axis
---
{{XsltSidebar}}
The ancestor-or-self axis indicates the context node and all of its ancestors, including the root node.
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data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/preceding/index.md | ---
title: preceding
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/preceding
page-type: xslt-axis
---
{{XsltSidebar}}
The preceding axis indicates all the nodes that precede the context node in the document except any ancestor, attribute, and namespace nodes.
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data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/following-sibling/index.md | ---
title: following-sibling
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/following-sibling
page-type: xslt-axis
---
{{XsltSidebar}}
The following-sibling axis indicates all the nodes that have the same parent as the context node and appear after the context node in the source docu... | 0 |
data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/child/index.md | ---
title: child
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/child
page-type: xslt-axis
---
{{XsltSidebar}}
The child axis indicates the children of the context node. If an XPath expression does not specify an axis, the child axis is understood by default. Since only the root node... | 0 |
data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/descendant-or-self/index.md | ---
title: descendant-or-self
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/descendant-or-self
page-type: xslt-axis
---
{{XsltSidebar}}
The descendant-or-self axis indicates the context node and all of its descendants. Attribute and namespace nodes are **not** included - the parent ... | 0 |
data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/self/index.md | ---
title: self
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/self
page-type: xslt-axis
---
{{XsltSidebar}}
The self axis indicates the context node itself. It can be abbreviated as a single period (`.`).
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data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/descendant/index.md | ---
title: descendant
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/descendant
page-type: xslt-axis
---
{{XsltSidebar}}
The descendant axis indicates all of the children of the context node, and all of their children, and so forth. Attribute and namespace nodes are **not** included ... | 0 |
data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/attribute/index.md | ---
title: attribute
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/attribute
page-type: xslt-axis
---
{{XsltSidebar}}
The attribute axis indicates the attributes of the context node. Only elements have attributes. This axis can be abbreviated with the at sign (`@`).
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data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/following/index.md | ---
title: following
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/following
page-type: xslt-axis
---
{{XsltSidebar}}
The following axis indicates all the nodes that appear after the context node, except any descendant, attribute, and namespace nodes.
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data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/namespace/index.md | ---
title: namespace
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/namespace
page-type: xslt-axis
---
{{XsltSidebar}}
The namespace axis indicates all the nodes that are in scope for the context node. In this case, the context node must be an element node.
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data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/the_netscape_xslt_xpath_reference/axes/preceding-sibling/index.md | ---
title: preceding-sibling
slug: Web/XSLT/Transforming_XML_with_XSLT/The_Netscape_XSLT_XPath_Reference/Axes/preceding-sibling
page-type: xslt-axis
---
{{XsltSidebar}}
The preceding-sibling axis indicates all the nodes that have the same parent as the context node and appear before the context node in the source doc... | 0 |
data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/for_further_reading/index.md | ---
title: For further reading
slug: Web/XSLT/Transforming_XML_with_XSLT/For_Further_Reading
page-type: guide
---
{{XsltSidebar}}
[« Transforming XML with XSLT](/en-US/docs/Web/XSLT/Transforming_XML_with_XSLT)
## Print
### Books
- **XSLT: Programmer's Reference, Second Edition**
- **Author**: Michael H. Kay
-... | 0 |
data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt | data/mdn-content/files/en-us/web/xslt/transforming_xml_with_xslt/an_overview/index.md | ---
title: An overview
slug: Web/XSLT/Transforming_XML_with_XSLT/An_Overview
page-type: guide
---
{{XsltSidebar}}
[« Transforming XML with XSLT](/en-US/docs/Web/XSLT/Transforming_XML_with_XSLT)
The eXtensible Stylesheet Language/Transform is a very powerful language, and a complete discussion of it is well beyond th... | 0 |
data/mdn-content/files/en-us/web | data/mdn-content/files/en-us/web/html/index.md | ---
title: "HTML: HyperText Markup Language"
slug: Web/HTML
page-type: landing-page
---
{{HTMLSidebar}}
**HTML** (HyperText Markup Language) is the most basic building block of the Web. It defines the meaning and structure of web content. Other technologies besides HTML are generally used to describe a web page's app... | 0 |
data/mdn-content/files/en-us/web/html | data/mdn-content/files/en-us/web/html/quirks_mode_and_standards_mode/index.md | ---
title: Quirks Mode
slug: Web/HTML/Quirks_Mode_and_Standards_Mode
page-type: guide
---
{{HTMLSidebar}}
In the old days of the web, pages were typically written in two versions: One for Netscape Navigator, and one for Microsoft Internet Explorer. When the web standards were made at W3C, browsers could not just star... | 0 |
data/mdn-content/files/en-us/web/html | data/mdn-content/files/en-us/web/html/microformats/index.md | ---
title: Microformats
slug: Web/HTML/microformats
page-type: guide
---
{{HTMLSidebar}}
[_Microformats_](https://microformats.org/) are standards used to embed semantics and structured data in HTML, and provide an API to be used by social web applications, search engines, aggregators, and other tools. These minimal ... | 0 |
data/mdn-content/files/en-us/web/html | data/mdn-content/files/en-us/web/html/element/index.md | ---
title: HTML elements reference
slug: Web/HTML/Element
page-type: landing-page
---
{{HTMLSidebar("HTML_Elements")}}
This page lists all the {{Glossary("HTML")}} {{Glossary("Element","elements")}}, which are created using {{Glossary("Tag", "tags")}}.
They are grouped by function to help you find what you have in m... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/br/index.md | ---
title: "<br>: The Line Break element"
slug: Web/HTML/Element/br
page-type: html-element
browser-compat: html.elements.br
---
{{HTMLSidebar}}
The **`<br>`** [HTML](/en-US/docs/Web/HTML) element produces a line break in text (carriage-return). It is useful for writing a poem or an address, where the division of lin... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/area/index.md | ---
title: "<area>: The Image Map Area element"
slug: Web/HTML/Element/area
page-type: html-element
browser-compat: html.elements.area
---
{{HTMLSidebar}}
The **`<area>`** [HTML](/en-US/docs/Web/HTML) element defines an area inside an image map that has predefined clickable areas. An _image map_ allows geometric area... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/aside/index.md | ---
title: "<aside>: The Aside element"
slug: Web/HTML/Element/aside
page-type: html-element
browser-compat: html.elements.aside
---
{{HTMLSidebar}}
The **`<aside>`** [HTML](/en-US/docs/Web/HTML) element represents a portion of a document whose content is only indirectly related to the document's main content. Asides... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/body/index.md | ---
title: "<body>: The Document Body element"
slug: Web/HTML/Element/body
page-type: html-element
browser-compat: html.elements.body
---
{{HTMLSidebar}}
The **`<body>`** [HTML](/en-US/docs/Web/HTML) element represents the content of an HTML document. There can be only one `<body>` element in a document.
## Attribut... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/li/index.md | ---
title: "<li>: The List Item element"
slug: Web/HTML/Element/li
page-type: html-element
browser-compat: html.elements.li
---
{{HTMLSidebar}}
The **`<li>`** [HTML](/en-US/docs/Web/HTML) element is used to represent an item in a list. It must be contained in a parent element: an ordered list ({{HTMLElement("ol")}}),... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/abbr/index.md | ---
title: "<abbr>: The Abbreviation element"
slug: Web/HTML/Element/abbr
page-type: html-element
browser-compat: html.elements.abbr
---
{{HTMLSidebar}}
The **`<abbr>`** [HTML](/en-US/docs/Web/HTML) element represents an abbreviation or acronym.
When including an abbreviation or acronym, provide a full expansion of ... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/figcaption/index.md | ---
title: "<figcaption>: The Figure Caption element"
slug: Web/HTML/Element/figcaption
page-type: html-element
browser-compat: html.elements.figcaption
---
{{HTMLSidebar}}
The **`<figcaption>`** [HTML](/en-US/docs/Web/HTML) element represents a caption or legend describing the rest of the contents of its parent {{HT... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/ul/index.md | ---
title: "<ul>: The Unordered List element"
slug: Web/HTML/Element/ul
page-type: html-element
browser-compat: html.elements.ul
---
{{HTMLSidebar}}
The **`<ul>`** [HTML](/en-US/docs/Web/HTML) element represents an unordered list of items, typically rendered as a bulleted list.
{{EmbedInteractiveExample("pages/tabbe... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/source/index.md | ---
title: "<source>: The Media or Image Source element"
slug: Web/HTML/Element/source
page-type: html-element
browser-compat: html.elements.source
---
{{HTMLSidebar}}
The **`<source>`** [HTML](/en-US/docs/Web/HTML) element specifies one or more media resources for the {{HTMLElement("picture")}}, {{HTMLElement("audio... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/dir/index.md | ---
title: "<dir>: The Directory element"
slug: Web/HTML/Element/dir
page-type: html-element
status:
- deprecated
browser-compat: html.elements.dir
---
{{HTMLSidebar}}{{Deprecated_Header}}
The **`<dir>`** [HTML](/en-US/docs/Web/HTML) element is used as a container for a directory of files and/or folders, potentiall... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/blockquote/index.md | ---
title: "<blockquote>: The Block Quotation element"
slug: Web/HTML/Element/blockquote
page-type: html-element
browser-compat: html.elements.blockquote
---
{{HTMLSidebar}}
The **`<blockquote>`** [HTML](/en-US/docs/Web/HTML) element indicates that the enclosed text is an extended quotation. Usually, this is rendered... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/nav/index.md | ---
title: "<nav>: The Navigation Section element"
slug: Web/HTML/Element/nav
page-type: html-element
browser-compat: html.elements.nav
---
{{HTMLSidebar}}
The **`<nav>`** [HTML](/en-US/docs/Web/HTML) element represents a section of a page whose purpose is to provide navigation links, either within the current docume... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/map/index.md | ---
title: "<map>: The Image Map element"
slug: Web/HTML/Element/map
page-type: html-element
browser-compat: html.elements.map
---
{{HTMLSidebar}}
The **`<map>`** [HTML](/en-US/docs/Web/HTML) element is used with {{HTMLElement("area")}} elements to define an image map (a clickable link area).
{{EmbedInteractiveExamp... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/button/index.md | ---
title: "<button>: The Button element"
slug: Web/HTML/Element/button
page-type: html-element
browser-compat: html.elements.button
---
{{HTMLSidebar}}
The **`<button>`** [HTML](/en-US/docs/Web/HTML) element is an interactive element activated by a user with a mouse, keyboard, finger, voice command, or other assisti... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/heading_elements/index.md | ---
title: "<h1>–<h6>: The HTML Section Heading elements"
slug: Web/HTML/Element/Heading_Elements
page-type: html-element
browser-compat: html.elements.h1
---
{{HTMLSidebar}}
The **`<h1>`** to **`<h6>`** [HTML](/en-US/docs/Web/HTML) elements represent six levels of section headings. `<h1>` is the highest section leve... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/caption/index.md | ---
title: "<caption>: The Table Caption element"
slug: Web/HTML/Element/caption
page-type: html-element
browser-compat: html.elements.caption
---
{{HTMLSidebar}}
The **`<caption>`** [HTML](/en-US/docs/Web/HTML) element specifies the caption (or title) of a table, providing the table an {{glossary("accessible descrip... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/title/index.md | ---
title: "<title>: The Document Title element"
slug: Web/HTML/Element/title
page-type: html-element
browser-compat: html.elements.title
---
{{HTMLSidebar}}
The **`<title>`** [HTML](/en-US/docs/Web/HTML) element defines the document's title that is shown in a {{glossary("Browser", "browser")}}'s title bar or a page'... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/tt/index.md | ---
title: "<tt>: The Teletype Text element"
slug: Web/HTML/Element/tt
page-type: html-element
status:
- deprecated
browser-compat: html.elements.tt
---
{{HTMLSidebar}}{{deprecated_header}}
The **`<tt>`** [HTML](/en-US/docs/Web/HTML) element creates inline text which is presented using the {{Glossary("user agent", ... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/main/index.md | ---
title: "<main>: The Main element"
slug: Web/HTML/Element/main
page-type: html-element
browser-compat: html.elements.main
---
{{HTMLSidebar}}
The **`<main>`** [HTML](/en-US/docs/Web/HTML) element represents the dominant content of the {{HTMLElement("body")}} of a document. The main content area consists of content... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/frameset/index.md | ---
title: <frameset>
slug: Web/HTML/Element/frameset
page-type: html-element
status:
- deprecated
browser-compat: html.elements.frameset
---
{{HTMLSidebar}}{{Deprecated_header}}
The **`<frameset>`** [HTML](/en-US/docs/Web/HTML) element is used to contain {{HTMLElement("frame")}} elements.
> **Note:** Because the ... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/noscript/index.md | ---
title: "<noscript>: The Noscript element"
slug: Web/HTML/Element/noscript
page-type: html-element
browser-compat: html.elements.noscript
---
{{HTMLSidebar}}
The **`<noscript>`** [HTML](/en-US/docs/Web/HTML) element defines a section of HTML to be inserted if a script type on the page is unsupported or if scriptin... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/menuitem/index.md | ---
title: <menuitem>
slug: Web/HTML/Element/menuitem
page-type: html-element
status:
- deprecated
- non-standard
---
{{HTMLSidebar}}{{Deprecated_Header}}{{Non-standard_header}}
The **`<menuitem>`** [HTML](/en-US/docs/Web/HTML) element represents a command that a user is able to invoke through a popup menu. This ... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/colgroup/index.md | ---
title: "<colgroup>: The Table Column Group element"
slug: Web/HTML/Element/colgroup
page-type: html-element
browser-compat: html.elements.colgroup
---
{{HTMLSidebar}}
The **`<colgroup>`** [HTML](/en-US/docs/Web/HTML) element defines a group of columns within a table.
{{EmbedInteractiveExample("pages/tabbed/colgr... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/dialog/index.md | ---
title: "<dialog>: The Dialog element"
slug: Web/HTML/Element/dialog
page-type: html-element
browser-compat: html.elements.dialog
---
{{HTMLSidebar}}
The **`<dialog>`** [HTML](/en-US/docs/Web/HTML) element represents a modal or non-modal dialog box or other interactive component, such as a dismissible alert, inspe... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/a/index.md | ---
title: "<a>: The Anchor element"
slug: Web/HTML/Element/a
page-type: html-element
browser-compat: html.elements.a
---
{{HTMLSidebar}}
The **`<a>`** [HTML](/en-US/docs/Web/HTML) element (or _anchor_ element), with [its `href` attribute](#href), creates a hyperlink to web pages, files, email addresses, locations in... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/footer/index.md | ---
title: "<footer>: The Footer element"
slug: Web/HTML/Element/footer
page-type: html-element
browser-compat: html.elements.footer
---
{{HTMLSidebar}}
The **`<footer>`** [HTML](/en-US/docs/Web/HTML) element represents a footer for its nearest ancestor [sectioning content](/en-US/docs/Web/HTML/Content_categories#sec... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/form/index.md | ---
title: "<form>: The Form element"
slug: Web/HTML/Element/form
page-type: html-element
browser-compat: html.elements.form
---
{{HTMLSidebar}}
The **`<form>`** [HTML](/en-US/docs/Web/HTML) element represents a document section containing interactive controls for submitting information.
{{EmbedInteractiveExample("p... | 0 |
data/mdn-content/files/en-us/web/html/element | data/mdn-content/files/en-us/web/html/element/data/index.md | ---
title: "<data>: The Data element"
slug: Web/HTML/Element/data
page-type: html-element
browser-compat: html.elements.data
---
{{HTMLSidebar}}
The **`<data>`** [HTML](/en-US/docs/Web/HTML) element links a given piece of content with a machine-readable translation. If the content is time- or date-related, the {{HTML... | 0 |
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