The HTTP Content-Security-Policy (CSP) style-src-attr directive specifies valid sources for inline styles applied to individual DOM elements.
The directive does not set valid sources for elements and elements with rel="stylesheet".
These are set using style-src-elem (and valid sources for all styles may be set with style-src).
Yes.
If this directive is absent, the user agent will look for the style-src directive, and if both of them are absent, fallback to default-src directive.
No resources of this type may be loaded. The single quotes are mandatory.
A space-separated list of source expression values. Resources of this type may be loaded if they match any of the given source expressions. For this directive, the following source expression values are applicable: