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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/Document/compatMode below:

Document: compatMode property - Web APIs

Document: compatMode property

Baseline Widely available

The Document.compatMode read-only property indicates whether the document is rendered in Quirks mode or Standards mode.

Value

A string that is one of the following:

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 Browser compatibility

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