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public css v1 · immutable<!doctype html><html lang="en"> <head> <style type="text/css">body { margin: 0; }div { border: 1px solid #000; height: 3cm; width: 3cm;} </style> </head> <body> <div>This box is 3 <abbr>cm</abbr> by 3 <abbr>cm</abbr>.</div> </body></html>