css data:image won't show in Firefox 58 - css

Question

I have trouble showing the data:image svg.
On my website I use this css snippet:
#menu > .close:before, #menu > .close:after {
-moz-transition: opacity 0.2s ease;
-webkit-transition: opacity 0.2s ease;
-ms-transition: opacity 0.2s ease;
transition: opacity 0.2s ease;
content: '';
display: block;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-position: center;
background-repeat: no-repeat;
background-size: 2em 2em;
}
#header nav ul li a[href="#menu"]:before {
background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100' preserveAspectRatio='none'%3E%3Cstyle%3Eline %7B stroke-width: 8px%3B stroke: %23f2849e%3B %7D%3C/style%3E%3Cline x1='0' y1='25' x2='100' y2='25' /%3E%3Cline x1='0' y1='50' x2='100' y2='50' /%3E%3Cline x1='0' y1='75' x2='100' y2='75' /%3E%3C/svg%3E");
opacity: 0;
}
#header nav ul li a[href="#menu"]:after {
background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100' preserveAspectRatio='none'%3E%3Cstyle%3Eline %7B stroke-width: 8px%3B stroke: %23585858%3B %7D%3C/style%3E%3Cline x1='0' y1='25' x2='100' y2='25' /%3E%3Cline x1='0' y1='50' x2='100' y2='50' /%3E%3Cline x1='0' y1='75' x2='100' y2='75' /%3E%3C/svg%3E");
opacity: 1;
}
It shows correctly in Chrome and used to show correctly in Firefox 57. But with the new update to Firefox 58 no svg file is shown anymore. So I looked into it and while inspecting the layout files in Firefox I saw that the above lines get Base64 encoded to e.g.
background-image: url("data:image/svg+xml;charset=utf8;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMDAiIGhlaWdodD0iMTAwIiB2aWV3Qm94PSIwIDAgMTAwIDEwMCIgcHJlc2VydmVBc3BlY3RSYXRpbz0ibm9uZSI+PHN0eWxlPmxpbmV7c3Ryb2tlLXdpZHRoOjhweDtzdHJva2U6IzU4NTg1OH08L3N0eWxlPjxwYXRoIGQ9Ik0wIDI1SDFlMnoiIC8+PHBhdGggZD0iTTAgNTBIMWUyeiIgLz48cGF0aCBkPSJNMCA3NUgxZTJ6IiAvPjwvc3ZnPg==");
Which won't display a svg file. I have no clue how to solve this problem. Maybe someone has an idea. Thanks.

Answer 1

Looks like your base64 data is incorrect. The below code worked for me (Pen)
Also you are missing the content property. Please take care of it, as its a mandatory property for the :before and :after pesudo elements.
.b:before {
content: "";
height: 100px;
width: 100px;
display: block;
background-image: url("data:image/svg+xml;base64,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");
}