I try:
set CSS Z-index: -1 after this <iframe> disappeared :(
make <iframe> on layer 0 and other object on layer 1. <iframe> is still top above to all layers
cannot find answer maybe someone help me. Ty for answer.
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I believe iFrames are html elements that sit on top of the canvas just like the text input object. There's no way to place them under any elements drawn on the canvas.