When testing in W3C, we got some errors such as:

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代碼 Line 42, Column 98: document type does not allow element "form" here; missing one of "object", "applet", "map", "iframe", "ins", "del" start-tag

…earch_form" action="/index.php/" method="get">

The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.

One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").




Line 155, Column 43: document type does not allow element "div" here; missing one of "object", "applet", "map", "iframe", "button", "ins", "del" start-tag
<div class="clear"><!-- DON'T DELETE --></div>

The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.

One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").

Why?

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Because in the code, i do as below:

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<span class="left">
<form action="XXX" method="XXX">
//Other codes
</form>
</span>


<span class="right">
<div class="clear"><!-- DON'T DELETE --></div>
</span>

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But that, put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>") is not allowed in W3C, the form element must be contained within only certain elements, but many more types of elements can be contained within the form element. For example: <p><form></form></p> that will not validate. However, this will: <form><p></p></form>

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