https://lists.w3.org/Archives/Public/www-style/2014Mar/0611.html
Re: [cssom-view] why not MediaQueryList.onchange from Simon Pieters on 2014-03-31 (www-style@w3.org...
https://www.w3schools.com/jsrEF/api_mediaquerylist.asp
MediaQueryList API
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
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https://developer.mozilla.org/en-US/docs/Web/API/MediaQueryList
MediaQueryList - Web APIs | MDN
A MediaQueryList object stores information on a media query applied to a document, with support for both immediate and event-driven matching against the state...
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