<form id="startsearch" method="get" action="">
<input type="text" value="Sök..." onclick="if(this.value == 'Sök...'){ this.value=''; }"/>
</form>
Varför validerar inte den koden?
Line 95, Column 94: 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.
…alue == 'Sök...'){ this.value=''; }"/>✉
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>").