SVG filter only working when added in style attribute (Firefox)
I added a blur effect svg to my HTML(text/html):
<html>
<head>...</head>
<body>
...
<svg xmlns="http://www.w3.org/2000/svg" height="0">
<filter height="116%" width="116%" y="-8%" x="-8%" id="svgBlur">
<feGaussianBlur stdDeviation="8" in="SourceGraphic"/>
</filter>
</svg>
</body>
</html>
Which I reference to in my CSS sheet:
#page-container {
filter: url("#svgBlur");
-webkit-filter: blur(8px);
}
Doing this makes the #page-container appear white (FF doesn't recognize the SVG filter).
The funky part:
When I disable the above filter rule in Firebug and readd it in the style attribute of the #page-container, it works like a charm.
<div id="page-container" style="filter: url("#svgBlur");">
What am I overseeing?
Response headers:
Cache-Control no-cache, must-revalidate, post-check=0, pre-check=0
Connection Keep-Alive
Content-Encoding gzip
Content-Language nl
Content-Length 6098
Content-Type text/html; charset=utf-8
Date Mon, 02 Dec 2013 14:47:01 GMT
Etag "1385995621"
Expires Sun, 19 Nov 1978 05:00:00 GMT
Keep-Alive timeout=15, max=100
Last-Modified Mon, 02 Dec 2013 14:47:01 +0000
Link </nl/node/215271>; rel="canonical",</nl/node/215271>; rel="shortlink"
Server Apache/2.2.3 (Red Hat)
Vary Accept-Encoding
X-Powered-By PHP/5.3.19
Problem on Firefox 25 OSX. Webkit browsers work fine, because they use the css blur filter
Answer
#svgBlur is a relative URL. It is converted to an absolute URL by prepending the name of the file it is in so
filter: url("#svgBlur");
in your case is really just a shorthand for
filter: url("stylesheet.css#svgBlur");
Which doesn't point to anything.
You need to put the name of the html file in the URL
filter: url("yourhtmlfile.html#svgBlur");
will work. And that's why it works when it's in the html file of course as the prepended filename points to the right place in that case.