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La Cumulative Layout Shift (CLS)is a term of growing importance in the field of natural referencing and website optimisation. This metric aims to evaluate the visual stability of a web page and its impact on theuser experience.
In this article, we'll explain what CLS is in SEO, why it's essential and how to improve your site's performance in terms of visual stability.
Le Cumulative Layout Shift is an indicator that measures the movement of the visible elements of a web page during loading or use.
It is calculated by multiplying the offset of each element by its relative share in space visible of the page. The closer the index is to zero, the less likely the user is to encounter unwanted movements on the page.
To better understand why this measure is important, imagine yourself reading an article on a site and suddenly an image appears and moves all the content downwards, forcing you to search for the location where you were.
This kind of unpleasant situation can have a negative impact on the user experience and encourage your visitors to leave your site quickly.
The Google search engine attaches particular importance to user experience and website performance. It is in this context that CLS has become a key indicator to monitor in order to improve a site's natural referencing.
According to Google, here are the recommended target values for the Cumulative Layout Shift:
To improve the stability of your web pages, here are a few recommendations to put into practice:
To prevent images and videos from lagging during loading, it is preferable to specify their size (height and width) in the code HTML or via CSS. This will allow the browser to instantly reserve the necessary space and avoid resizing during loading.
If your site includes advertisements, widgets or other dynamic elements, it is important to reserve enough space to display them without disrupting the main content. You can, for example, use containers with fixed dimensions to accommodate these elements while preserving the visual stability of the page.
Shifts can also be caused by style (CSS) modifications applied too late when the page is loaded. Try to avoid nested styles and declare important CSS rules upstream to ensure that they are taken into account from the start of rendering.
Loading fonts and running animations can also generate undesirable movements on your pages. To limit these problems, use system fonts or optimised font services, and don't hesitate to deactivate complex animations or animations that take a long time to load.
By working on these different aspects, you will not only improve your site's SLC, but also help to provide a satisfying and enjoyable user experience for your visitors. There's no doubt that this approach will pay dividends in terms of natural referencing and the success of your site. website.
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