Check out example codes for "html u tag". It will help you in understanding the concepts better.

Code Example 1

Ex. Underline word "parragraph" using 'u' tag:

<p>This is a <u>parragraph</u>.</p>

Code Example 2

<p>This is a <u>parragraph</u>.</p>

Code Example 3

<p>This text is not underlined</p><u>This text is underlined</u>

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