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@lovalotta(おもちねこ)

javascriptからDOCTYPEを取得する

Last updated at Posted at 2015-06-26

もしかしたらDOCTYPEを見てJavaScriptの挙動を変えたい時があるかもしれないのでメモ。

次の3つから情報が得られる。.internalSubsetってのもあるらしいけれど、nullしか確認できてないので無視。

  • document.doctype.name
  • document.doctype.publicId
  • document.doctype.systemID

このうち、.nameはhtmlなので、それ以外を見る。

<!DOCTYPE html>

  • "html"
  • ""
  • ""

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  • "html"
  • "-//W3C//DTD HTML 4.01 Transitional//EN"
  • "http://www.w3.org/TR/html4/loose.dtd"
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