The Document.compatMode
read-only property indicates whether the document is rendered in Quirks mode or Standards mode.
Document.compatMode
Value
An enumerated value that can be:
- "
BackCompat
" if the document is in quirks mode. - "
CSS1Compat
" if the document is in no-quirks (also known as "standards") mode or limited-quirks (also known as "almost standards") mode.
Note: All these modes are now standardized, so the older "standards" and "almost standards" names are nonsensical and no longer used in standards.
Examples
if (document.compatMode == "BackCompat") { // in Quirks mode }
Specifications
Specification |
---|
DOM Standard # ref-for-dom-document-compatmode① |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
compatMode |
1
|
12
|
1
|
6
|
≤12.1
|
3.1
|
1
|
18
|
4
|
≤12.1
|
2
|
1.0
|
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https://developer.mozilla.org/en-US/docs/Web/API/Document/compatMode