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並前往https://rocketvalidator.com/html-validation/bad-value-x-for-attribute-src-on-element-iframe-illegal-character-in-query-space-is-not-allowed

Bad value X for attribute “src” on element “iframe” - Rocket ...

An <iframe> element allows to embed an HTML document inside another HTML ... Element “script” must not have attribute “defer” unless attribute “src” is also ...

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查詢 「Iframe defer」的人也找了：

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