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並前往https://rocketvalidator.com/html-validation/a-link-element-with-a-rel-attribute-that-contains-the-value-preload-must-have-an-as-attribute

A “link” element with a “rel” attribute that contains the value ...

Guide describing the HTML issue detected by the W3C Validator: A “link” element with a “rel” attribute that contains the value “preload” must have an “as” ...

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