Propagate zoom factor in the top window into iframe through postMessage #24
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Send the zoom factor into each <iframe>s through `postMessage` if changed its value in the top window.
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#21 did not work in the local HTML file exported by Marp CLI.
Thus, I take the second appraoch to propagate zoom factor into iframes. Send the zoom factor into each <iframe>s through
postMessageif changed its value in the top window.