data:text/html,<style>*{display:block;margin:0;padding:0;font-family:monospace}html{min-height:100vh;display:flex;justify-content:center;align-items:center}style{width:16ch;word-break:break-all;&::before{content:'<style>'

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It's a unit of measurement, short for character width, specially the width of a 0 of the font. It's most useful for monospace fonts since all the characters are the same width.

something i'm missing what does the ch mean 

been a while since i did any thing css