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Mention whitespace normalization in attribute values. https://www.w3.org/Bugs/Public/show_bug.cgi?id=22008 
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‎Overview.html‎

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@@ -433,6 +433,11 @@ <h3 id="syntax-misc"><span class="secno">2.4 </span>Miscellaneous</h3>
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<li><p>Attributes omitting quotes for the value are allowed to use a larger
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set of characters compared to HTML4.
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<li><p>The HTML parser does not do any normalization of whitespace in attribute values; for instance, leading and trailing whitespace in the
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<code class="external" title="attr-id"><a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#the-id-attribute">id</a></code> attribute is not ignored (and thus now invalid), and newline characters can be used in the
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<code class="external" title="attr-input-value"><a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#attr-input-value">value</a></code> attribute of the <code class="external"><a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#the-input-element">input</a></code> element without using character
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references.
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<li><p>The <code>optgroup</code> end tag is now optional.
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‎Overview.src.html‎

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@@ -405,6 +405,11 @@ <h3 id="syntax-misc">Miscellaneous</h3>
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<li><p>Attributes omitting quotes for the value are allowed to use a larger
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set of characters compared to HTML4.
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<li><p>The HTML parser does not do any normalization of whitespace in attribute values; for instance, leading and trailing whitespace in the
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<code data-anolis-spec=html title=attr-id>id</code> attribute is not ignored (and thus now invalid), and newline characters can be used in the
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<code data-anolis-spec=html title=attr-input-value>value</code> attribute of the <code data-anolis-spec=html>input</code> element without using character
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references.
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<li><p>The <code>optgroup</code> end tag is now optional.
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‎Overview.whatwg.html‎

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@@ -378,6 +378,11 @@ <h3 id="syntax-misc"><span class="secno">2.4 </span>Miscellaneous</h3>
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<li><p>Attributes omitting quotes for the value are allowed to use a larger
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set of characters compared to HTML4.
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<li><p>The HTML parser does not do any normalization of whitespace in attribute values; for instance, leading and trailing whitespace in the
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<code class="external" title="attr-id"><a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#the-id-attribute">id</a></code> attribute is not ignored (and thus now invalid), and newline characters can be used in the
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<code class="external" title="attr-input-value"><a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#attr-input-value">value</a></code> attribute of the <code class="external"><a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#the-input-element">input</a></code> element without using character
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references.
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<li><p>The <code>optgroup</code> end tag is now optional.
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