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【HTML】loading属性で“lazy”を指定する場合、widthとheight属性が必要

Last updated at Posted at 2019-09-17

loading属性とは、ブラウザがネイティブで遅延ロードをサポートするというものです。

img要素やiframe要素をHTMLの属性として指定するだけで、JavaScriptを使うことなく、簡単に遅延ロードさせることができます。

例)

<img src="画像パス" loading="lazy" alt="hogehoge">

ところがどっこい、、、

スクリーンショット 2019-09-18 2.43.57.png

[Intervention] An element was lazyloaded with loading=lazy, but had no dimensions specified. Specifying dimensions improves performance. See https://crbug.com/954323

widthとheight属性も同時に指定しないとChromeに怒られてしまいます。

<img src="画像パス" loading="lazy" alt="hogehoge" width="***" height="***">

widthとheight属性を指定してあげれば問題ありません。
本来、横幅・高さ属性というのはレンダリング計算上、必要なものなので。。

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