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<!DOCTYPE html
><title>Only one 300px*300px green quadrate. No red</title
><body style="overflow: hidden; max-width: 800px; max-height: 500px;"
><h1>Only one 300px*300px green quadrate. No red.</h1
><table style="writing-mode: vertical-lr; width: 100px; height: 300px; background: red; border-spacing: 0px; border: 0;"
><tr
><td style="width: 300px; background: green; color: white; padding: 0; border: 0;"></td
></tr
></table
></body>