Fixing layout instability | Articles | web.dev

[ { "name": "", "entryType": "layout-shift", "startTime": 210.78500000294298, "duration": 0, "value": 0.0001045969445437389, "hadRecentInput": false, "lastInputTime": 0 } ] In this example there was a single very tiny shift of 0.01% at 210ms. Knowing the time and severity of the shift is useful to help narrow down what could have caused the shift. Let's turn back to WebPageTest for a lab environme

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`PerformanceObserver`でCumulative Layout Shift (CLS)を計測し、どのようなレイアウトの変化が起きてるのかをWebPageTestで確認する方法について。 また、実際にプレースホルダーデータを使ってlayout instabilityを修正する方法について。