![]() There is a toggle to show layout shifts, combine that with ‘huge’ screenshot images and a 0.1s interval to get a clear view of what is happening as your page renders (you can simply add this to the end of the URL: &highlightCLS=1&thumbSize=600&ival=100&end=visual&text=000&bg=fff"). There are a number of methods to detect layout shifts due to web fonts, the most simple is to run your page through WebPageTest and use the filmstrip view. Flash of Unstyled Text Detecting layout shifts Fusce in maximus ante, non malesuada justo. Vestibulum tempus diam vel ex venenatis placerat. Nam ultrices rhoncus dui, at pretium erat rhoncus et. Maecenas rhoncus faucibus dui quis pretium. Praesent feugiat consequat risus, ut eleifend neque consequat quis. Mauris cursus diam id ipsum aliquet tempus. Morbi vel dui non risus aliquam rhoncus in ac justo. Suspendisse quis elit fringilla, luctus felis ut, ultricies leo. Proin aliquam metus eu lacus placerat feugiat. ![]() Lorem ipsum dolor sit amet, consectetur adipiscing elit. When laying out a page, browsers will use the dimensions and properties of the fallback font to determine the size of the containing elements, even if you have declared a web font to block the system font with font-display: block! This occurs when the height of the font or the length of the paragraph is different with the web font compared to the system font. a or paragraph) changes when the web font is downloaded. Fonts cause layout shifts when the size of the containing element (e.g. Unexpected layout shifts (page content moving around without user interaction) are bad for user experience. host your own fonts on your main domain.use variable fonts or a limited set of weight variations.use font-display: optional to prevent layout shifts.In summary we need to prevent the layout shift by letting the browser render in a fallback system font if it doesn’t get the web font in time, then optimise our fonts to try to get them to the browser before it needs them: In this post we will explore the surprisingly complex world of text rendering on the web and some techniques to remove FOUT while not incurring a CLS penalty. One common cause of layout shift is surprisingly difficult to resolve though: flashes of unstyled text (FOUT). Some sources of layout shifts have been simple to resolve: pre-allocate the correct space for dynamic elements, use width and height attributes on images and prioritise visible elements in your HTML document. ![]() One of the outcomes of the release of Core Web Vitals (and subsequent inclusion in Google’s page ranking algorithm) is that we have been paying more attention to unexpected layout shifts and the cumulative layout shift (CLS) score. ![]()
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December 2022
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