HTML attribute with/without quotes

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时光取名叫无心 2020-11-27 08:08
Is there any difference between
and
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                <span>(楼主)</span>
            
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                <span>2020-11-27 08:36</span>
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<p>There is no practical difference except</p>

<ol>
<li>if you validate your page, quotation marks may or may not be
needed to avoid error messages, depending on doctype being used</li>
<li>if you serve the page with an XML content type to browsers (which
is rare and seldom useful), then the quotes are required – otherwise
the page is not displayed at all, just an error message</li>
<li>if the page is otherwise processed with XML tools, the quotes are necessary.</li>
</ol>

<p>Otherwise, the quotation marks are really needed only if the attribute value contains a space, a line break, an Ascii quotation mark ("), an Ascii apostrophe ('), a grave accent (`), an equals sign (=), a less than sign (<), or a greater than sign (>). So <code>style = width:20em</code> would work (though it might be seen as somewhat obscure), whereas <code>style = width: 20em</code> would not – due to the space, you would need to write <code>style = "width: 20em"</code>.</p>

<p>Many people always write quotation marks around all attribute values, for simplicity. Others think that quotation marks make the code a bit messy, so they omit them when possible.</p>

<p>Quite independently of this, <code>src="www.example.com"</code> means a relative URL reference, not what people expect to mean. You probably meant <code>src="http://www.example.com"</code>.</p>
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