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HTML

              
                <h1>Hexadecimal color values in SVG as data url</h1>
<p>This works in Firefox and WebKits:</p>
<figure id="keyword">
	<div></div>
	<figcaption><code>background-image: url('data:image/svg+xml,&lt;svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"&gt;&lt;circle fill="<mark>red</mark>" cx="10" cy="10" r="10"/&gt;&lt;/svg&gt;')</code></figcaption>
</figure>
<p>RGB(A) and HSL(A) color values work as well. One might think hexadecimal values like <code>#F00</code> would work the same. They even do in some browsers, but do not in others (e.g. Firefox):
</p>
<figure id="hex-unescaped">
	<div></div>
	<figcaption><code>background-image: url('data:image/svg+xml,&lt;svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"&gt;&lt;circle fill="<mark>#F00</mark>" cx="10" cy="10" r="10"/&gt;&lt;/svg&gt;')</code></figcaption>
</figure>

<p>Reason: <code>#</code> in URLs starts a fragment identifier. If you mean the character #, you need to escape it: <code>%23</code> in this case.</p>
<figure id="hex-escaped">
	<div></div>
	<figcaption><code>background-image: url('data:image/svg+xml,&lt;svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"&gt;&lt;circle fill="<mark>%23</mark>F00" cx="10" cy="10" r="10"/&gt;&lt;/svg&gt;')</code></figcaption>
</figure>

<p>Thanks to Robert Longson for pointing that out.</p>

<p>Internet Explorer needs <code>&lt;</code>, <code>&gt;</code>, <code>"</code> <code'</code> to be percent-escaped as <code>%C3</code>, <code>%3E</code>, <code>%22</code>and <code>%27</code>, respectively:</p>
<figure id="url-escaped">
	<div></div>
	<figcaption><code>background-image: url('data:image/svg+xml,<mark>%3C</mark>svg xmlns=<mark>%22</mark>http://www.w3.org/2000/svg<mark>%22</mark> viewBox=<mark>%22</mark>0 0 20 20<mark>%22</mark><mark>%3E</mark><mark>%3C</mark>circle fill=<mark>%22</mark>%23F00<mark>%22</mark> cx=<mark>%22</mark>10<mark>%22</mark> cy=<mark>%22</mark>10<mark>%22</mark> r=<mark>%22</mark>10<mark>%22</mark>/<mark>%3E</mark><mark>%3C</mark>/svg<mark>%3E</mark>')</code></figcaption>
</figure>

<p>Don’t blame IE, this is according to RFC 2397 / RFC 2396 and successor RFC 3986.


              
            
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CSS

              
                #keyword div {
		background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"><circle fill="red" cx="10" cy="10" r="10"/></svg>')
}

#hex-unescaped div {
		background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"><circle fill="#F00" cx="10" cy="10" r="10"/></svg>')
}

#hex-escaped div {
		background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"><circle fill="%23F00" cx="10" cy="10" r="10"/></svg>')
}

#url-escaped div {
		background-image: url('data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 20 20%22%3E%3Ccircle fill=%22%23F00%22 cx=%2210%22 cy=%2210%22 r=%2210%22/%3E%3C/svg%3E')
}

html {
		font: 1em/1.5 sans-serif;
}

figure {
		margin: 1em 0;
		padding: 0
}

figcaption {
		margin-top: 0.5em;
		max-width: 80ch
}

figure>div {
		width: 4em;
		height: 4em;
		background-repeat: no-repeat
}

* {
		box-sizing: border-box
}
              
            
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JS

              
                
              
            
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