Cancel the keydown in an HTML page?

How can I cancel the keydown of a button on the keyboard in an HTML开发者_开发技巧 page.

Thanks

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It's somewhat more complicated than described so far, see Quirksmode.org:

You cannot prevent the default onkeydown in Opera.

In Opera, use onkeypress instead.

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Handle the onkeydown event and return false;

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Try this

<input type="button" onkeydown="return false;" />