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並前往https://rocketvalidator.com/html-validation/bad-value-for-attribute-width-height-on-element-iframe-the-empty-string-is-not-a-valid-non-negative-integer

height)” on element “iframe”: The empty string is not a valid ...

Guide describing the HTML issue detected by the W3C Validator: Bad value “” for attribute “(width|height)” on element “iframe”: The empty string is not a ...

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