fix: do not report fragment-only CSS URLs #1208
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CSS defines a special processing for the resolution of fragment-only URLs.
These are resolved based on the HTML document, not relative to the
stylesheet.
For example, an SVG filter inlined in the HTML can be refered in CSS as:
```
* {
filter: url(#filter);
}
```
Such fragment-only URLs were previously reported as errors in EPUBCheck,
since the related fragment could not be found in the CSS document!
This change fixes the issue by ignoring fragment-only URLs in CSS. In
other words, these URLs will not be registered to the XRefChecker.
Fixes #1198
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CSS defines a special processing for the resolution of fragment-only URLs.
These are resolved based on the HTML document, not relative to the
stylesheet.
For example, an SVG filter inlined in the HTML can be refered in CSS as:
Such fragment-only URLs were previously reported as errors in EPUBCheck,
since the related fragment could not be found in the CSS document!
This change fixes the issue by ignoring fragment-only URLs in CSS. In
other words, these URLs will not be registered to the XRefChecker.
Fixes #1198