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Opera API BUG or visual problem with <button> html element

Hi to all.
This problem was found in 9.63 version but in 9.64 still have.
When i am working with layers and transparency, i created 3 layers and in bottom level layer layed element <button type="button">....</button>
& when when upper layer appeared i still can hit the button. But this element works fine:
<input type="button" .../>. In other browsers its not happened.

.....