doc_copystyles.css

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

html, body, #testid {

  color: #F00;

  background-color: #00F;

  font-size: 12px;

  border-color: #00F !important;

  --var: "*/";

:where(#testid) {

  color: gold;

  --unused-1: 1;

  --unused-2: 2;

  --unused-3: 3;

  --unused-4: 4;

  --unused-5: 5;

  --unused-6: 6;

  --unused-7: 7;

  --unused-8: 8;

  --unused-9: 9;

  --unused-10: 10;

  --unused-11: 11;

  --unused-12: 12;

  --unused-13: 13;

  background-color: tomato;