Crisp image zoom at 150% DPI scale factor displays (Firefox 74+)CSS
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Prevents blurry anti-aliased borders between picture sampling areas ("pixels") by stretching them so they precisely match (multiples of) physical display points. Adds variable background for transparent images.
MDN: Content first (Header to Footer)CSS
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Moves main content to the top, so the header with dropdown menus lands above footer. Also compacts /play sandbox.
Graphemica: Different Fonts on HoverCSS
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Change font families of example characters by position mouse cursor over body or character and/or holding left mouse button
Bing: Definition box auto expanderJS
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Clicks the "See more" button for you. Sadly, that button is really interactive after some time, so there is a delay.
codepoints.net add sample character examplesJS
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Seeing "embedded" page font examples is neat, but sometimes it is useful to see how your own system handles glyphs on its own. This script adds samples for each displayed instance.