Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Mozilla サポートの検索

サポート詐欺に注意してください。 私たちはあなたに通話やショートメッセージの送信、個人情報の共有を求めることはありません。疑わしい行為を見つけたら「迷惑行為を報告」からご報告ください。

詳しく学ぶ
このスレッドはアーカイブに保管されました。 必要であれば新たに質問してください。
解決済み アーカイブに保管済み

HTML5

Firefox ヒントと活用法
andrew011 replied
sam6000
sam6000

How to know if the page someone is browsing is HTML5?

For example, if I'm browsing php webpage then I right click on the page and "View Page Info", I get this: Type: "application/xhtml+xml".

I tried that on HTML5 webpage but I got the following: Type: "text/html".

How to know if the page someone is browsing is HTML5? For example, if I'm browsing php webpage then I right click on the page and "View Page Info", I get this: Type: "application/xhtml+xml". I tried that on HTML5 webpage but I got the following: Type: "text/html".

すべての返信 (4)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor

選ばれた解決策

If the page is HTML5 then you should see this DOCTYPE in the Page Source: <!DOCTYPE html>

Jafar Muhammed
Jafar Muhammed

Right Click on the page and select View Page Source. Then at the very first line of HTML source code You can see its doc type.

HTML5 doc type and older version doc types are different.

HTML5 doc type is

< !DOCTYPE HTML >


Older HTML versions doc type is 

< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >
sam6000
sam6000 質問者

Thank you "cor-el", that was helpful.

"pmjcreations", I just read that the "html" is "case-sensitive": "In XHTML5 the DOCTYPE must be a case-sensitive match of the string "DOCTYPE html"."'

この投稿は sam6000 により に変更されました

andrew011
andrew011

Simple HTML5 doc type is : < !DOCTYPE HTML >
Whereas older HTML doc type is :
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

Thanks
http://www.csschopper.com/psd-to-html5-css3.shtml