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32 lines
655 B
HTML
32 lines
655 B
HTML
<!DOCTYPE html>
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<html>
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<body>
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<p class="a">Class a.</p>
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<p class="b">Class b.</p>
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<p id="start">
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<b class="a">This a class.</b>
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<b class="b">This b class.</b>
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</p>
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<script>
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function myFunction() {
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var el = document.getElementById('start');
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console.assert(!(el === null), 'start exists');
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var x = el.querySelector('.nonexistent');
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console.assert(x === null, 'nonexistent element');
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var y = el.querySelector('.b');
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console.assert(!(y === null), 'Class b');
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var inp = y.innerHTML;
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console.assert(inp === 'This b class.', 'Class b.');
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}
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console.error('element.querySelector.html');
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myFunction();
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console.exit();
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</script>
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</body>
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</html>
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