Cumulative Layout Shift

How much stuff moves around on a page after it loads

The most annoying thing some news websites do is display a huge advertisement at the top of a page that pushes all of the content down as you’re reading it or displays a huge pop-up over the article. Either way, you lose track of your spot where you were reading and have to scroll down or close the pop-up to continue reading. This irritating experience is known as a high cumulative layout shift.

News websites with low cumulative layout shifts either don’t display as many advertisements or they load the page with those spots as blank areas, shifting the content before you start reading, and fill them in later with an advertisement.

Legible News has no cumulative layout shift because it doesn’t not display ads.

Read Google's technical explanation of the Cumulative Layout Shift audit.

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