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Submitted URL: https://developer.mozilla.org/docs/Web/CSS/:invalid
Effective URL: https://developer.mozilla.org/en-US/docs/Web/CSS/:invalid
Submission: On April 14 via api from US
Effective URL: https://developer.mozilla.org/en-US/docs/Web/CSS/:invalid
Submission: On April 14 via api from US
DOM tree The "DOM" is the Document Object Model