From http://www.w3schools.com (Copyright Refsnes Data)

HTML <s> and <strike> tags

The s and strike elements are deprecated.

Example

Strikethrough text can be marked up as follows:

<p>Version 2.0 is <s>not yet available!</s> now available!</p>

<p>Version 2.0 is <strike>not yet available!</strike> now available!</p>

The <s> and <strike> tags defines strikethrough text.

The <s> and <strike> tags are supported in all major browsers.

The <s> and <strike> elements were deprecated in HTML 4.01, and are not supported in XHTML 1.0 Strict DTD.

Tip: Use the del element instead!

id, class, title, style, dir, lang, xml:lang

For a full description, go to Standard Attributes.

onclick, ondblclick, onmousedown, onmouseup, onmouseover, onmousemove, onmouseout, onkeypress, onkeydown, onkeyup

For a full description, go to Event Attributes.