Editing HTML element (section)

==== Attributes ====
'''[[HTML attribute]]s''' define desired behavior or indicate additional element properties. Most attributes require a ''value''. In HTML, the value can be left unquoted if it does not include spaces (<code>{{var|attribute}}={{var|value}}</code>), or it can be quoted with single or double quotes (<code>{{var|attribute}}='{{var|value}}'</code> or <code>{{var|attribute}}="{{var|value}}"</code>). In [[XML]], those quotes are required.

[[Boolean data type|Boolean]] attributes, on the other hand, do not require a value to be specified. An example is the <code>checked</code> for checkboxes:
<syntaxhighlight lang="html">
<input type=checkbox checked>
</syntaxhighlight>
In the XML (and thus [[XHTML]]) syntax, though, a value is required, and the name should be repeated as the value:
<syntaxhighlight lang="xml">
<input type="checkbox" checked="checked" />
</syntaxhighlight>