CLS stands for Cumulative Layout Shift - but what is it and why is it relevant?
In 2020, people started getting a message in their Google Search Console. It said that there are challenges with CLS on their site. So more and more people asked "What is CLS?".
In short, CLS is when a page "jumps". You've probably tried it. You load a page from a newspaper. You click on the top article, but as you click, a banner ad is placed right above the article. This means that the article is pushed down and your click actually lands on the banner ad. It makes for a bad experience for you. And also for the advertiser, as they only want visitors who are interested in clicking on their ad. So basically: A bad experience.
That's not the kind of experience Google wants to send you to. That's why they've announced that CLS will be a parameter in their algorithm from 2021 and if they notice that your page "jumps and dances" as it loads, they will warn you about it in Google Search Console.
Therefore, you will find that you can get a warning about CLS in Google Search Console.
You can read more about CLS here.
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