Walidator w3 wywala błąd gdy w tym skrypcie przycisk jest jeszcze w znacznikach <form>, lecz gdy jest po </form> to już wszystko wporządku:
Oto błąd:
Line 38, Column 117: document type does not allow element "input" here; missing one of "p", "h1", "h2", "h3", "h4", "h5", "h6", "div", "pre", "address", "fieldset", "ins", "del" start-tag.
…px; height: 25px; margin-top: 5px;" />
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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>").