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並前往https://forum.blocsapp.com/t/how-to-defer-parsing-of-youtube-iframes-via-javascript/12213

How to defer parsing of YouTube iFrames via JavaScript

... recommend changing the iFrame embed code's “src” to “data-src” and then use JavaScript in the footer to defer loading of that iFrame.

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查詢 「Iframe defer」的人也找了：

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