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fix(builtin_scene): make background-position function correctly (#331)
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‎fixtures/html/background-position-bottom-right-test.html‎

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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Background Position Bottom/Right Alignment Test</title>
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<style>
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body {
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margin: 0;
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padding: 20px;
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font-family: Arial, sans-serif;
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background-color: #fff;
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}
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.test-container {
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margin: 20px 0;
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padding: 10px;
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border: 1px solid #ccc;
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background-color: #f5f5f5;
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}
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h1 {
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color: #333;
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font-size: 24px;
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margin-bottom: 20px;
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}
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h2 {
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color: #666;
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font-size: 18px;
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margin: 15px 0 10px 0;
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}
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.test-box {
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width: 200px;
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height: 150px;
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border: 2px solid #333;
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background-image: url(https://ar.rokidcdn.com/web-assets/yodaos-jsar/dist/images/a.jpg);
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background-size: 50px 50px;
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background-repeat: no-repeat;
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margin: 10px;
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position: relative;
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}
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.test-box::after {
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content: '';
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position: absolute;
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top: 0;
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left: 0;
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right: 0;
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bottom: 0;
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border: 1px dashed red;
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pointer-events: none;
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}
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/* Test cases that should align to bottom-right */
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.bg-position-right-bottom-keywords {
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background-position: right bottom;
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}
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.bg-position-100-percent {
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background-position: 100% 100%;
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}
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.bg-position-right-100-percent {
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background-position: right 100%;
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}
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.bg-position-100-bottom {
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background-position: 100% bottom;
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}
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/* Test cases that should align to bottom-left */
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.bg-position-left-bottom {
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background-position: left bottom;
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}
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.bg-position-0-100-percent {
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background-position: 0% 100%;
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}
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/* Test cases that should align to top-right */
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.bg-position-right-top {
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background-position: right top;
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}
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.bg-position-100-0-percent {
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background-position: 100% 0%;
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}
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.test-row {
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display: flex;
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flex-wrap: wrap;
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gap: 10px;
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margin-bottom: 20px;
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}
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.test-description {
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font-size: 12px;
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color: #666;
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text-align: center;
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margin-top: 5px;
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width: 200px;
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}
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.expected {
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font-weight: bold;
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color: #007700;
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}
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</style>
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</head>
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<body>
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<h1>CSS Background Position Bottom/Right Alignment Test</h1>
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<div class="test-container">
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<h2>Bottom-Right Alignment Tests (Image should be in bottom-right corner)</h2>
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<p>All these tests should position the 50x50px background image in the bottom-right corner of each 200x150px box:</p>
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<div class="test-row">
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<div>
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<div class="test-box bg-position-right-bottom-keywords"></div>
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<div class="test-description">
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background-position: right bottom<br>
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<span class="expected">Expected: bottom-right corner</span>
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</div>
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</div>
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<div>
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<div class="test-box bg-position-100-percent"></div>
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<div class="test-description">
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background-position: 100% 100%<br>
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<span class="expected">Expected: bottom-right corner</span>
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</div>
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</div>
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<div>
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<div class="test-box bg-position-right-100-percent"></div>
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<div class="test-description">
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background-position: right 100%<br>
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<span class="expected">Expected: bottom-right corner</span>
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</div>
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</div>
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<div>
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<div class="test-box bg-position-100-bottom"></div>
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<div class="test-description">
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background-position: 100% bottom<br>
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<span class="expected">Expected: bottom-right corner</span>
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</div>
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</div>
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</div>
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</div>
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<div class="test-container">
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<h2>Other Corner Alignment Tests</h2>
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<p>These tests verify other corner positions work correctly:</p>
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<div class="test-row">
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<div>
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<div class="test-box bg-position-left-bottom"></div>
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<div class="test-description">
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background-position: left bottom<br>
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<span class="expected">Expected: bottom-left corner</span>
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</div>
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</div>
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<div>
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<div class="test-box bg-position-0-100-percent"></div>
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<div class="test-description">
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background-position: 0% 100%<br>
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<span class="expected">Expected: bottom-left corner</span>
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</div>
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</div>
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<div>
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<div class="test-box bg-position-right-top"></div>
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<div class="test-description">
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background-position: right top<br>
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<span class="expected">Expected: top-right corner</span>
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</div>
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</div>
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<div>
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<div class="test-box bg-position-100-0-percent"></div>
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<div class="test-description">
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background-position: 100% 0%<br>
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<span class="expected">Expected: top-right corner</span>
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</div>
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</div>
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</div>
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</div>
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<div class="test-container">
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<h2>Expected Results</h2>
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<p>According to CSS specification:</p>
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<ul>
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<li><strong>right bottom</strong> and <strong>100% 100%</strong> should be identical - both place image in bottom-right corner</li>
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<li><strong>left bottom</strong> and <strong>0% 100%</strong> should be identical - both place image in bottom-left corner</li>
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<li><strong>right top</strong> and <strong>100% 0%</strong> should be identical - both place image in top-right corner</li>
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<li>Images should be flush with the edges (no gaps or offsets)</li>
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</ul>
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<p>If the implementation is incorrect, percentage values may not align properly with keyword values.</p>
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<h3>Implementation Notes</h3>
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<p>The fix handles cases where "100% 100%" is parsed as two length values instead of percentages.
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Common percentage values (0%, 25%, 50%, 75%, 100%) are detected and processed correctly to ensure
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proper edge alignment according to CSS Background and Borders Module Level 3 specification.</p>
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</div>
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</body>
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</html>

‎fixtures/html/background-position-fix-demo.html‎

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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Background Position Fix Demo</title>
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<style>
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body {
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margin: 20px;
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font-family: Arial, sans-serif;
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}
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.demo-container {
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display: flex;
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gap: 20px;
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margin: 20px 0;
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}
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.test-box {
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width: 150px;
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height: 100px;
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border: 2px solid #333;
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background: linear-gradient(45deg, #ff6b6b 0%, #4ecdc4 50%, #ffe66d 100%);
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background-size: 30px 30px;
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background-repeat: no-repeat;
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position: relative;
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}
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.test-box::after {
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content: '';
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position: absolute;
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top: 0;
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left: 0;
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right: 0;
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bottom: 0;
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border: 1px dashed red;
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pointer-events: none;
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}
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.bottom-right-keywords {
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background-position: right bottom;
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}
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.bottom-right-percent {
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background-position: 100% 100%;
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}
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.top-right-percent {
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background-position: 100% 0%;
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}
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.bottom-left-percent {
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background-position: 0% 100%;
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}
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.description {
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text-align: center;
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font-size: 12px;
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margin-top: 5px;
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color: #666;
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}
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.success {
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color: #007700;
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font-weight: bold;
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}
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</style>
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</head>
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<body>
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<h1>Background Position Bottom/Right Alignment Fix</h1>
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<p>This demonstrates the fix for background-position alignment. Each box shows a 30x30px gradient positioned in different corners of a 150x100px container.</p>
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<div class="demo-container">
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<div>
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<div class="test-box bottom-right-keywords"></div>
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<div class="description">
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<code>background-position: right bottom;</code><br>
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<span class="success">✓ Bottom-right corner</span>
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</div>
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</div>
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<div>
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<div class="test-box bottom-right-percent"></div>
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<div class="description">
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<code>background-position: 100% 100%;</code><br>
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<span class="success">✓ Should match right bottom</span>
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</div>
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</div>
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<div>
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<div class="test-box top-right-percent"></div>
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<div class="description">
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<code>background-position: 100% 0%;</code><br>
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<span class="success">✓ Top-right corner</span>
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</div>
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</div>
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<div>
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<div class="test-box bottom-left-percent"></div>
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<div class="description">
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<code>background-position: 0% 100%;</code><br>
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<span class="success">✓ Bottom-left corner</span>
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</div>
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</div>
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</div>
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<h2>Fix Summary</h2>
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<p><strong>Issue:</strong> Background images with percentage positions (like <code>100% 100%</code>) were not aligning flush with element edges.</p>
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<p><strong>Solution:</strong> Enhanced the <code>calculateBackgroundPosition</code> function to properly detect and handle percentage values in two-value background-position syntax.</p>
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<p><strong>Result:</strong> Perfect edge alignment matching CSS specification behavior.</p>
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</body>
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</html>

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