JavaScript document.compatMode Property

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JavaScript document.compatMode Property

The document.compatMode property returns whether the document is rendered in Quirks mode or Standards mode.

Note: The return mode is an enumerated value that can be

  • "CSS1Compat" - if the document is in Standards mode.
  • "BackCompat" - if the document is in quirks mode.

Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <p id="point"></p> <script> var x = document.getElementById("point"); x.innerHTML = "You Browser mode: " + document.compatMode; </script> </body> </html>

Syntax

document.compatMode

Return Values

ValueExplanation
StringReturns whether the document is rendered in Quirks mode or Standards mode.

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