1.1 Marking method in HTMl5
1. Content type
The file extension remains unchanged, it is still .htm or .htm, and the content type is "text/html"
2. DOCTYPE statement
<!DOCTYPE HTML>
3. Specify the encoding of characters
<meta charset = “utf-8”> (utf-8 is recommended)
1.2 HTML ensures compatibility with previous HTML versions
three aspects:
1. Marked elements can be omitted
The elements that do not allow the use of closing tags are: area, base, br, col, command, embed, hr, img, input, keygen, link, meta, param, source, track, wbr.
The end tag elements that can be omitted are: li, dt, dd, p, rt, rp, optgroup, option, colgroup, thread, tbody, tfoot, tr, td, th.
All marked elements that can be omitted are: html, head, body, colgroup, tbody.
2. Attributes with boolean
Reference code example:
<!—Writing only attributes without writing attribute values means that the attribute is true-->
<input type = “checkbox” checked>
<!—Attribute value= attribute name, which means the attribute is true-->
<input type = “checkbox” checked = “checked”>
3. Omit quotation marks
When the attribute value does not include empty strings, "<", ">", "=", single quotes, double quotes and other characters, the symbols on both sides of the attribute can be omitted.
<input type = text>
1.2 Marking example
<!DOCTYPE HTML>
<meta charset = “utf-8”>
<title>HTML5 markup example</title>
<p>This code is HTML5
<br/>Written in syntax
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