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42 lines
1.1 KiB
XML
42 lines
1.1 KiB
XML
<!DOCTYPE qhelp PUBLIC
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"-//Semmle//qhelp//EN"
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"qhelp.dtd">
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<qhelp>
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<overview>
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<p>
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According to the HTML5 standard, the value of the <code>id</code> attribute of an element must be
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unique amongst all the IDs in the element's home subtree. In particular, a single HTML document
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must not contain two elements with the same ID. Documents that do not conform to this restriction may be
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interpreted differently by different browsers.
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</p>
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</overview>
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<recommendation>
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<p>
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Choose unique IDs for all elements inside a document. If the <code>id</code> attributes are used
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to attach style information to the elements via CSS, consider using <code>class</code> attributes
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instead.
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</p>
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</recommendation>
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<example>
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<p>
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The following HTML document contains two <code>li</code> elements with the same ID:
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</p>
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<sample src="examples/AmbiguousIdAttribute.html"/>
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<p>
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Instead, each element should have its own unique ID:
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</p>
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<sample src="examples/AmbiguousIdAttributeGood.html"/>
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</example>
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<references>
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<li>HTML5 Standard: <a href="https://www.w3.org/TR/html5/dom.html#the-id-attribute">3.2.5.1 The id attribute</a>.</li>
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</references>
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</qhelp>
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