html5 - Whether browser recognize document HTML version -


i have html document written in html 4. used required attribute html 5 worked surprise. saw error red border when input empty. think browser recognized document html 5 document , ignored doctype. question is, how browser google chrome recognize html document version.

thanks hints.

<!doctype html public "-//w3c//dtd html 4.01//en" "http://www.w3.org/tr/html4/strict.dtd">  <html>  <head>      <style>          input:invalid {              border: 2px dashed red;          }            input:valid {              border: 2px solid black;          }      </style>  </head>  <body>  <form>      <label for="name">name</label>      <input id="name" name="name" required>      <button>submit</button>  </form>  </body>  </html>

how browser google chrome recognize html document version

they don't. parse html.

(the exception being doctype switching, uses doctype, switch between "good" , "1990s" behaviour, not detect version.)


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