HTML <u> tag
In HTML4.01, the <u> tag was used to underline a text.
Later, it was deprecated in HTML4.
It was obsolete in HTML5 also but later reintroduced with another specific purpose to check the spelling mistake or misspell texts.
<p>Only I can <u>change my life.</u> No one can do it for me.</p>
CSS Default Value
How Browser will display
Difference between HTML4.01, XHTML and HTML5
|Deprecated in HTML4.01||NA||Reintroduced in HTML5|
Attributes used with <u> tag
The <u> tag supports Global attributes.
The <u> tag supports Event attributes.
<span>, <strong> & <b> tags.