Add <style> support to allowStyles API

[emersion]

douceur already supports parsing full CSS stylesheets. Would you accept a patch sanitizing <style> elements content in addition to style attributes?

[grafana-dee]

Yes.

So long as there were a policy construction interface along the lines of the HTML sanitization policy builder, I'd definitely accept a PR that did this.

[emersion]

We already sanitize style attributes. The same should be applied to declarations in <style> elements.

[emersion]

What you're talking about is already done:

bluemonday/sanitize.go

Line 670 in 0a75d76

func (p *Policy) sanitizeStyles(attr html.Attribute, elementName string) html.Attribute {

[Simerax]

Any Update on this?