Removed integrity check and test for no-cors requests
Removed Step 30.2 which raised a JS TypeError if the integrity metadata was not empty. I manually ran `new Request("", {"mode" : "no-cors", "integrity" : "not an empty string"});` in servo to validate that the exception no longer arose.
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Implemented paint worklets drawing to a border.
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Allow paint worklets to draw to a border.
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Fix issues with the combination of position:sticky and tables
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- [ ] These changes fix#18441 (github issue number if applicable).
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