• Skip to main content
  • Skip to search
  • Skip to select language
    • Technologies Overview
    • HTML
    • CSS
    • JavaScript
    • Graphics
    • HTTP
    • APIs
    • Browser Extensions
    • MathML
    • Learn web development
    • Tutorials
    • References
    • Developer Guides
    • Accessibility
    • Game development
    • ...more docs
    • Send Feedback
    • Contribute to MDN
    • Report a content issue 🌐
    • Report a platform issue 🌐
  1. Web technology for developers
  2. Web APIs
  3. Window
  4. Window.length
  • Change language

Table of contents

  • Syntax
  • Example
  • Specifications
  • Browser compatibility

Window.length

Returns the number of frames (either <frame> or <iframe> elements) in the window.

Syntax

framesCount = window.length;
  • framesCount is the number of frames.

Example

if (window.length) {
  // this is a document with subframes
}

Specifications

Specification
HTML Standard (HTML)
# dom-length-dev

Browser compatibility

BCD tables only load in the browser

Found a problem with this page?

  • Edit on GitHub
  • Source on GitHub
  • Report a problem with this content on GitHub
  • Want to fix the problem yourself? See our Contribution guide.

Last modified: Sep 14, 2021, by MDN contributors

Change your language

Related Topics

  1. Window
  2. Properties
    1. applicationCache
    2. closed
    3. console
    4. crypto
    5. customElements
    6. defaultStatus
    7. devicePixelRatio
    8. dialogArguments
    9. document
    10. event
    11. frameElement
    12. frames
    13. fullScreen
    14. history
    15. innerHeight
    16. innerWidth
    17. length
    18. localStorage
    19. location
    20. locationbar
    21. menubar
    22. mozAnimationStartTime
    23. mozInnerScreenX
    24. mozInnerScreenY
    25. mozPaintCount
    26. name
    27. navigator
    28. onappinstalled
    29. onbeforeinstallprompt
    30. ondevicemotion
    31. ondeviceorientation
    32. ondeviceorientationabsolute
    33. ondragdrop
    34. ongamepadconnected
    35. ongamepaddisconnected
    36. onvrdisplayactivate
    37. onvrdisplayblur
    38. onvrdisplayconnect
    39. onvrdisplaydeactivate
    40. onvrdisplaydisconnect
    41. onvrdisplayfocus
    42. onvrdisplaypointerrestricted
    43. onvrdisplaypointerunrestricted
    44. onvrdisplaypresentchange
    45. opener
    46. outerHeight
    47. outerWidth
    48. pageXOffset
    49. pageYOffset
    50. parent
    51. performance
    52. personalbar
    53. pkcs11
    54. screen
    55. screenLeft
    56. screenTop
    57. screenX
    58. screenY
    59. scrollbars
    60. scrollMaxX
    61. scrollMaxY
    62. scrollX
    63. scrollY
    64. self
    65. sessionStorage
    66. sidebar
    67. speechSynthesis
    68. status
    69. statusbar
    70. toolbar
    71. top
    72. visualViewport
    73. window
  3. Methods
    1. alert()
    2. back()
    3. blur()
    4. cancelAnimationFrame()
    5. cancelIdleCallback()
    6. captureEvents()
    7. clearImmediate()
    8. close()
    9. confirm()
    10. convertPointFromNodeToPage()
    11. convertPointFromPageToNode
    12. dump()
    13. find()
    14. focus()
    15. forward()
    16. getComputedStyle()
    17. getDefaultComputedStyle()
    18. getSelection()
    19. home()
    20. matchMedia()
    21. minimize()
    22. moveBy()
    23. moveTo()
    24. open()
    25. openDialog()
    26. postMessage()
    27. print()
    28. prompt()
    29. releaseEvents()
    30. requestAnimationFrame()
    31. requestFileSystem()
    32. requestIdleCallback()
    33. resizeBy()
    34. resizeTo()
    35. scroll()
    36. scrollBy()
    37. scrollByLines()
    38. scrollByPages()
    39. scrollTo()
    40. setCursor()
    41. setImmediate()
    42. showDirectoryPicker()
    43. showModalDialog()
    44. showOpenFilePicker()
    45. showSaveFilePicker()
    46. sizeToContent()
    47. stop()
    48. updateCommands()
  4. Events
    1. event
    2. afterprint
    3. animationcancel
    4. animationend
    5. animationiteration
    6. beforeprint
    7. beforeunload
    8. blur
    9. copy
    10. cut
    11. DOMContentLoaded
    12. error
    13. focus
    14. hashchange
    15. languagechange
    16. load
    17. message
    18. messageerror
    19. offline
    20. online
    21. orientationchange
    22. pagehide
    23. pageshow
    24. paste
    25. popstate
    26. rejectionhandled
    27. storage
    28. transitioncancel
    29. unhandledrejection
    30. unload
    31. vrdisplayconnect
    32. vrdisplaydisconnect
    33. vrdisplaypresentchange
  5. Inheritance:
    1. EventTarget
  • Web Technologies
  • Learn Web Development
  • About MDN
  • Feedback
  • About
  • MDN Web Docs Store
  • Contact Us
  • Firefox

MDN

  • MDN on Twitter
  • MDN on Github

Mozilla

  • Mozilla on Twitter
  • Mozilla on Instagram

© 2005-2021 Mozilla and individual contributors. Content is available under these licenses.

  • Terms
  • Privacy
  • Cookies