I've tried using fit-content, fill-content, height="100%", and height="auto" I'm not sure if this is possible, but if it's not google definitely should try and figure out a way to make it work.
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<body>
    <iframe
        src="https://docs.google.com/spreadsheets/d/e/2PACX-1vR-p4uEH_VDK55IPAhz94TLM03oZ40dis2blDnH_vm31QC8BaqqO0VvZU9c3u_EHS0WB8z1O92NDiae/pubhtml?gid=0&single=true&widget=true&headers=false"
        width="100%" height="fill-content"></iframe>
</body>
</html> 
If you want your iframe to fill the height of the window, you will need to specify the height as a style, i.e. style="height: 100vh;" instead of  as an attribute.
<iframe src="https://docs.google.com/spreadsheets/d/e/2PACX-1vR-p4uEH_VDK55IPAhz94TLM03oZ40dis2blDnH_vm31QC8BaqqO0VvZU9c3u_EHS0WB8z1O92NDiae/pubhtml?gid=0&single=true&widget=true&headers=false" width="100%" style="height: 100vh;"></iframe>If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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