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Prevent Embedded JavaScript from Failing Validation

Ever see that CDATA stuff in JavaScript and wonder what it was for? It is to prevent the validator from reading that code as markup and failing validation. For example, ampersands (&) and greater-than / less-than signs (< >)are often culprits for failing validation when it's actually perfectly OK to use them in JavaScript.

<script type="text/javascript">
  //<![CDATA[

    alert("<This is compatible with XHTML>");

  //]]>
</script>