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CSS Property:

text-decoration-line:

none

underline

overline

line-through

underline overline

underline overline line-through

initial

Note: The text-decoration-line property is not supported in any of the major browsers.

Note: Firefox supports an alternative, the -moz-text-decoration-line property.

Result:

Hello world!

CSS Code:

#myDIV {
    text-decoration-line: underline;
}

Click the property values above to see the result

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