Can you explain the purpose of the URL function in the context of url("#foobar"

Currently, I am developing a CSS concatenator and one of the tasks involved is URL to absolute URL rewriting.

For this process, I exclude any absolute URLs that start with http, https, etc. In the case of Django projects, they designate the following URL formats to be ignored:

body {
    background: url("#foobar");
    background: url("http:foobar");
    background: url("https:foobar");
    background: url("data:foobar");
    background: url("//foobar");
}

Here you can find an example file of ignored URL formats in Django projects.

I have come across all of these except for the background: url("#foobar"); format.

This specific format is also used in their test cases as seen below:

div {
    behavior: url("#default#VML");
}

Check out this link for more examples of URL definitions in Django projects.

What exactly does "url('#foobar')" refer to? Is it standard CSS syntax, or maybe some kind of MSIE hack?

css

Answer №1

This code snippet is commonly used to reference an image within a document.

As illustrated in the article Using SVG:

<svg ...>
  <filter id="imageFilter" >
    <feGaussianBlur stdDeviation="5" />
  </filter> 
</svg>

Corresponding CSS:

.picture:hover {
  filter: url(#imageFilter);
}

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