Validation - document type does not allow element "h4" here

I can't find out what the problem is with this开发者_C百科 line of code:

<h4><span class="orange">mytitle</span></h4>

This is the error message I receive:

document type does not allow element "h4" here;

What do I need to change? Cheers Mic

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<h4> (like all headers) is a block level element. You've probably put it directly inside something that doesn't allow it, like <table> or <tr> or an inline element (<span>, <a> ).