W3C错误：文档类型不允许元素X在这里; 缺少Y开始标记之一

Question

In my HTML/PHP code I have the following piece of code which makes sure the filtering is removed from a group of fields with JavaScript.

<form id="prices" action="">
<div class="box searchPrices" id="pricesDiv">
    <h2>Prijzen
    <p class="removeAll" rel="prices"></p>
    <span></span>
    </h2>
    ...
    </div>
</form>

This works as expected, but now my W3C validation is not validating correctly anymore. Is there a nice way to go around this caveat to make sure it validates nicely and still removes the filtering?

The W3C error I get:

document type does not allow element "p" here; missing one of "object", "applet", "map", "iframe", "button", "ins", "del" start-tag

Answer 1

HTML4:

You're recieving an error because it isn't valid mark-up. You can't include <p> tags inside <h2> tags.

You can however, use elements such as <span> inside heading tags as they are inline.

Take a look at the relevant specification section here - navigate around and you'll find which elements are allowed where etc (basically, all entities under the special section).

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HTML5:

As of HTML5, It is still invalid to have paragraphs inside heading tags, according to the HTML5 specification .