Baseline Widely available
The read-only CSSStyleSheet property ownerRule returns the CSSImportRule corresponding to the @import at-rule which imported the stylesheet into the document. If the stylesheet wasn't imported into the document using @import, the returned value is null.
A CSSImportRule corresponding to the @import rule which imported the stylesheet into the document. If the stylesheet wasn't imported into the document using @import, the returned value is null.
This snippet of code looks for rules which were not imported into the document using an @import at-rule.
const ruleList = document.styleSheets[0].cssRules;
for (const rule of ruleList) {
if (!rule.ownerRule) {
/* rule is not imported */
}
}
This snippet obtains a reference to the stylesheet associated with the @import and processes it in some manner:
const ruleList = document.styleSheets[0].cssRules;
for (const rule of ruleList) {
if (rule.ownerRule) {
checkStylesheet(rule.ownerRule.styleSheet);
}
}
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