text-decoration style

You can also see the w3schools document on Text-Decoration;

Some examples are:-

text-decoration:overline;
This is an example of text with an overline.

text-decoration:line-through;
This is an example of text with a line-through.

text-decoration:underline;
This is an example of text with an underline.

text-decoration:underline overline;
This is an example of text with an underline & overline.

text-decoration:underline overline line-through;
This is an example of text with an underline, overline & line-through.

You can also use text-decoration-more... to set:-

text-decoration-color
Sets the colour of the action, eg...

    text-decoration:underline;
    text-decoration-color:red;
This is an example of text with a red underline.

    text-decoration:line-through;
    text-decoration-color:red;
This is an example of text with a red line-through.

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text-decoration-style
Sets the style of the action, eg...
(eg...solid, wavy, dotted, dashed, double)

    text-decoration:underline;
    text-decoration-color:red;
    text-decoration-style:wavy;
This is an example of text with a red wavy underline.

    text-decoration:line-through;
    text-decoration-color:red;
    text-decoration-style:double;
This is an example of text with a red double line-through.