https://caniuse.com/mdn-api_stylepropertymapreadonly_size
StylePropertyMapReadOnly API: size | Can I use... Support tables for HTML5, CSS3, etc
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https://developer.mozilla.org/en-US/docs/Web/API/StylePropertyMapReadOnly/keys
StylePropertyMapReadOnly: keys() method - Web APIs | MDN
The StylePropertyMapReadOnly.keys() method returns a new array iterator containing the keys for each item in StylePropertyMapReadOnly
web apiskeysmethodmdn