HTML.lt;sub.gt; tags
The content contained in the label and its end label, slt;/sub,gt; is displayed below half the height of normal content and is usually smaller, see the following example:Browser support
All major browsers support the hashtag.
Label definition and instructions for use
The label defines the underlying text. T he underseed text appears below the baseline at half the character height in the current text stream, but is the same font and font size as the Chinese word in the current text stream. The underseed text can be used to represent chemical formulas, such as H 2 O.
Tip: Please use the label definition for the upper text.
The difference between HTML 4.01 and HTML5
No.
Global properties
The label supports the global properties of HTML.
The event property
The tag supports the event properties of HTML.