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including data URIs, control characters (ASCII 0 to 31, and 127) and spaces (ASCII 32) are "excluded characters". This means that [[whitespace character]]s are not permitted in data URIs. However, in the context of HTML 4 and HTML 5, linefeeds within an element attribute value (such as the "src" above) are ignored{{Citation needed|reason=linefeeds are signifcant in the title attribute, so not ignored in HTML attributes|date=August 2017}}. So the data URI above would be processed ignoring the linefeeds, giving the correct result. But note that this is an HTML feature, not a data URI feature, and in other contexts, it is not possible to rely on whitespace within the URI being ignored.
===CSS===
A [[Cascading Style Sheets|Cascading Style Sheets (CSS)]] rule that includes a background image:
<syntaxhighlight lang="css">
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