How to identify HTML5

Is there anyway to determine whether an HTML file was written in HTML5?

Solution 1:

_{oversimplified}
If it uses an HTML5 doctype, it's HTML5.

<!DOCTYPE html>

Solution 2:

HTML 5 websites will not have a reference to the DTD in the doctype. Thus, the doctype tag at the top of the file will look like this:

<!DOCTYPE html>

Instead of one of these:

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

You could also check if any HTML5 tags are used...

Solution 3:

1) Check <!DOCTYPE html> at the start of the file

<!doctype html>
    <html>
      <head>
        <title>A blank HTML5 page</title>
        <meta charset="utf-8" />
      </head>
      <body>
      </body>
    </html>

2) Detect certain HTML5 only elements such as Canvas.

Solution 4:

If a page uses the HTML5 doctype (<!DOCTYPE html>), you can determine it as a html5.

How to identify HTML5

Solution 1:

Solution 2:

Solution 3:

Solution 4:

Related

Recent Posts