Introduction to HTML5 syntax changes

Comments: HTML5 syntax changes mainly refer to tags that are no longer case sensitive, elements that can omit end tags, attributes that can omit attribute values, and so on. For more information, see, I hope to help you understand html5. 1. labels are no longer case sensitive.

The Code is as follows:
<P> Hello, World! </P>

2. The end tag can be omitted for an element.

(1) Empty element syntax elements: area, base, br, col, command, embed, hr, img, input, keygen, link, mata, param, source, wbr
(2) elements of the end tag can be omitted: colgroup, dt, dd, li, optgroup, p, rt, rp, thread, tbody, tfoot, tr, td, th
(3) You can omit all tag elements: html, head, body, and tbody.

3. attributes that allow omitting attribute values
4. attribute values are not enclosed in quotation marks.