HTML5 and sup, respectively, define sub-labels and super-labels for content in the document. Please refer to the following example:
Underseed text:
<p>这个文本包含 <sub>下标</sub>文本。</p>Browser support
All major browsers support the hashtag.
Definitions and usages
The label defines the subseeding text. The upper text can be defined.
The difference between HTML 4.01 and HTML 5
No.
Example
这段文本包含 <sub>下标</sub>
这段文本包含 <sup>上标</sup>
Property
The standard property
class, contenteditable, contextmenu, dir, draggable, id, irrelevant, lang, ref, registrationmark, tabindex, template, title
For a complete description, visit standard properties in HTML 5.
The event property
onabort, onbeforeunload, onblur, onchange, onclick, oncontextmenu, ondblclick, ondrag, ondragend, ondragenter, ondragleave, ondragover, ondragstart, ondrop, onerror, onfocus, onkeydown, onkeypress, onkeyup, onload, onmessage, onmousedown, onmousemove, onmouseover, onmouseout, onmouseup, onmousewheel, onresize, onscroll, onselect, onsubmit, onunload
For a complete description, visit event properties in HTML 5. 、
Labels are useful when adding footnotes to documents and representing exponential values in equations!