How can I blur a whole page using CSS? Other elements such as images are allowed.
Answer
This is working in Firefox and WebKit using the filter: blur(radius). See Can I Use: CSS filters for which browsers can support this.
.blurredElement {
/* Any browser which supports CSS3 */
filter: blur(1px);
/* Firefox version 34 and earlier */
filter: url("blur.svg#gaussian_blur");
/* Webkit in Chrome 52, Safari 9, Opera 39, and earlier */
-webkit-filter: blur(1px);
}
The blur.svg for Firefox 34 or below looks like this:
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<defs>
<filter id="gaussian_blur">
<feGaussianBlur in="SourceGraphic" stdDeviation="1" />
</filter>
</defs>
</svg>
You can adjust the radius, but lower values mean better performance.