Question

“The id attribute got more classy in HTML5” is written at some pages. If I use class attribute instead of id, does it conform to HTML5? Thanks for your help.

Answer 1

I believe you’re talking about this article. Well, nothing has really changed — classes and ids are used the same way as in HTML4.

Except one thing: The HTML4 spec says the following

ID and NAME tokens must begin with a letter ([A-Za-z]) and may be
followed by any number of letters, digits ([0-9]), hyphens (“-“),
underscores (“_”), colons (“:”), and periods (“.”).

However, in the HTML5 spec, the requirement for ids is much less rigid

The value must be unique amongst all the IDs in the element’s home
subtree and must contain at least one character. The value must not
contain any space characters.

So HTML5 ids can accept more characters, which is what the article you’re reffering to is talking about.