https://www.w3schools.com/jsrEF/prop_screen_availheight.asp
Screen availHeight Property
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screenproperty
https://developer.mozilla.org/en-US/docs/Web/API/Screen/availHeight
Screen: availHeight property - Web APIs | MDN
The read-only Screen interface's availHeight property returns the height, in CSS pixels, of the space available for Web content on the screen. Since Screen is...
web apisscreenpropertymdn