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Is the doctype part of the DOM, and if so, is there a good cross-browser way to read it? I'm not trying to do anything fancy. I just want to access the doctype information from within some JavaScript code. Read-only access is fine.

Is the doctype part of the DOM, and if so, is there a good cross-browser way to read it? I'm not trying to do anything fancy. I just want to access the doctype information from within some JavaScript code. Read-only access is fine.

  • javascript
  • doctype
Share Improve this question asked Dec 31, 2009 at 23:37 user241761user241761 1031 silver badge4 bronze badges
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document.doctype seems to be the (read-only) property you're looking for.

If you're inspecting the DOCTYPE to determine if you're in quirksmode or not, this is known to be cross-browser:

document.patMode; // returns either "BackCompat" or "CSS1Compat"

So you can do:

var quirksmode = document.patMode == "BackCompat";

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