• Skip to main content
  • Skip to search
  • Skip to select language
MDN Web Docs
  • References
    • Overview / Web Technology

      Web technology reference for developers

    • HTML

      Structure of content on the web

    • CSS

      Code used to describe document style

    • JavaScript

      General-purpose scripting language

    • HTTP

      Protocol for transmitting web resources

    • Web APIs

      Interfaces for building web applications

    • Web Extensions

      Developing extensions for web browsers

    • Accessibility

      Build web projects usable for all

    • Web Technology

      Web technology reference for developers

  • Learn
    • Overview / MDN Learning Area

      Learn web development

    • MDN Learning Area

      Learn web development

    • HTML

      Learn to structure web content with HTML

    • CSS

      Learn to style content using CSS

    • JavaScript

      Learn to run scripts in the browser

    • Accessibility

      Learn to make the web accessible to all

  • Plus
    • Overview

      A customized MDN experience

    • AI Help

      Get real-time assistance and support

    • Updates

      All browser compatibility updates at a glance

    • Documentation

      Learn how to use MDN Plus

    • FAQ

      Frequently asked questions about MDN Plus

  • Curriculum New
  • Blog
    • Playground

      Write, test and share your code

    • HTTP Observatory

      Scan a website for free

    • AI Help

      Get real-time assistance and support

  • Log in
  • Sign up for free
  1. References
  2. XML
  3. XPath
  4. Reference
  5. Functions
  6. false
    • Deutsch
    • Français
    • 日本語
    • 한국어

In this article

  • Syntax
  • Description
  • Specifications
  • Gecko support
  1. XML
  2. XML Guides
    1. XML introduction
    2. Parsing and serializing XML
    3. OpenSearch description format
  3. XPath
  4. Guides
    1. XPath snippets
    2. Comparison of CSS Selectors and XPath
    3. Introduction to using XPath in JavaScript
  5. Functions
    1. boolean
    2. ceiling
    3. choose
    4. concat
    5. contains
    6. count
    7. current
    8. document
    9. element-available
    10. false
    11. floor
    12. format-number
    13. function-available
    14. generate-id
    15. id
    16. key
    17. lang
    18. last
    19. local-name
    20. name
    21. namespace-uri
    22. normalize-space
    23. not
    24. number
    25. position
    26. round
    27. starts-with
    28. string
    29. string-length
    30. substring
    31. substring-after
    32. substring-before
    33. sum
    34. system-property
    35. translate
    36. true
    37. unparsed-entity-url
  6. Axes
  7. XSLT
  8. Guides
    1. Transforming XML with XSLT
    2. PI Parameters
    3. Common XSLT Errors
  9. Elements
  10. EXSLT
  11. Common (exsl)
    1. exsl:node-set()
    2. exsl:object-type()
  12. Math (math)
    1. math:highest()
    2. math:lowest()
    3. math:max()
    4. math:min()
  13. Regular expressions (regexp)
    1. regexp:match()
    2. regexp:replace()
    3. regexp:test()
  14. Sets (set)
    1. set:difference()
    2. set:distinct()
    3. set:has-same-node()
    4. set:intersection()
    5. set:leading()
    6. set:trailing()
  15. Strings (str)
    1. str:concat()
    2. str:split()
    3. str:tokenize()

In this article

  • Syntax
  • Description
  • Specifications
  • Gecko support

false

The false function returns boolean false.

Syntax

false()

Return value

Boolean false.

Description

This function is useful part of a comparison:

xml

  The expression evaluates as true

Specifications

XPath 1.0 4.3

Gecko support

Supported.

Help improve MDN

Learn how to contribute.

This page was last modified on Feb 5, 2025 by MDN contributors.

View this page on GitHub • Report a problem with this content
MDN logo

Your blueprint for a better internet.

  • MDN on Bluesky
  • MDN on Mastodon
  • MDN on X (formerly Twitter)
  • MDN on GitHub
  • MDN Blog RSS Feed

MDN

  • About
  • Blog
  • Careers
  • Advertise with us

Support

  • Product help
  • Report an issue

Our communities

  • MDN Community
  • MDN Forum
  • MDN Chat

Developers

  • Web Technologies
  • Learn Web Development
  • MDN Plus
  • Hacks Blog
  • Website Privacy Notice
  • Cookies
  • Legal
  • Community Participation Guidelines

Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation.
Portions of this content are ©1998–2025 by individual mozilla.org contributors. Content available under a Creative Commons license.