<!DOCTYPE html> <meta charset="UTF-8"> <title>CSS Writing Modes Test: 'writing-mode: vertical-lr' set to <body> element propagates to viewport</title> <link rel="author" title="GĂ©rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/"> <link rel="help" href="https://www.w3.org/TR/css-writing-modes-3/#principal-flow" title="8. The Principal Writing Mode"> <!-- Issue 3066: [css-writing-modes] Does vertical writing mode of an HTML body element cause an orthogonal flow? https://github.com/w3c/csswg-drafts/issues/3066 --> <link rel="match" href="wm-propagation-body-033-ref.html"> <meta name="assert" content="This test checks that when the root element has a <body> child element, then the principal writing mode is instead taken from the values of writing-mode and direction on the first such child element instead of taken from the root element. Also, a small script in this test verifies that the computed value of 'writing-mode' of the root element itself is not affected by such propagation."> <!-- Tests 032 to 035: html's writing-mode is not specified Tests 036 to 039: html's writing-mode is specified as horizontal-tb Tests 040 to 043: html's writing-mode is specified as vertical-rl Tests 044 to 047: html's writing-mode is specified as vertical-lr Tests 048 to 051: html's writing-mode is specified as sideways-rl Tests 052 to 055: html's writing-mode is specified as sideways-lr --> <style> html::before { background-color: orange; content: ""; display: block; height: 100px; margin-left: 8px; margin-top: 8px; margin-right: 1em; width: 100px; } body { writing-mode: vertical-lr; } h1#second-test-condition { background-color: red; color: yellow; } </style> <script> function verifyComputedValueDocRoot() { if(getComputedStyle(document.documentElement)["writing-mode"] == "horizontal-tb") { document.getElementById("second-test-condition").style.display = "none"; }; /* If the computed value of 'writing-mode' of the root element itself is not affected by such propagation, then the big FAIL word will not be displayed. */ } </script> <body onload="verifyComputedValueDocRoot();"> <div><img src="support/wm-propagation-body-003-exp-res.png" width="340" height="37" alt="Image download support must be enabled"></div> <!-- The image says: Test passes if there is an orange square in the <strong>upper-left corner</strong> of the page. --> <h1 id="second-test-condition">FAIL</h1>