How to ensure text remains visible during web font load? Clicking the audit reveals the list of web font URLs. If GTmetrix finds even one web font URL without the above declarations, this audit triggers. GTmetrix identifies all the web fonts declared in the CSS and checks to see if a font-display attribute has been specified for each web font with either of the following values:
Improve server response time (deprecated).Defer loading of JavaScript (deprecated).Combine external JavaScript (deprecated).Avoid Flash on mobile webpages (deprecated).Avoid CSS Avoid CSS expressions (deprecated).Use passive listeners to improve scrolling performance.Use explicit width and height on image elements.Serve static assets with an efficient cache policy.Replace large JavaScript libraries with smaller alternatives (deprecated).Remove duplicate modules in JavaScript bundles.Lazy load third-party resources with facades.Keep request counts low and transfer sizes small.Ensure text remains visible during webfont load.Don't lazy load Largest Contentful Paint image.Avoid serving legacy JavaScript to modern browsers.This requires a developer working closely with the code, and a diagnostic tool like Lighthouse, to optimize webfont delivery. Modern browsers allow you to eliminate layout shifting entirely by preloading optional fonts - combining with font-display: optional. The image below shows FOIT and FOUT alongside one another, taken from ' Font loading strategy: The acceptable FOIT', which also suggests a combination approach of a very short FOIT followed by a FOUT fallback.īy optimizing rendering cycles, Chrome 83 eliminates layout shifting when preloading optional fonts.
Depending on how long it takes for the webfont to load, this can display a 'flash of unstyled text' (FOUT), which can still be a jarring experience for the user. The most common way to avoid the flash of invisible text is to tell the browser to display text immediately by using a system font. This Hint will trigger for any internal URL that uses font URLs which may flash invisible text. This means it takes longer before the user is able to engage with the text content, and also c auses the layout to change during rendering, which can be jarring for the user. This means that other elements of the page content will often load before the font loads, and some browsers will hide text content during the 'font wait time', which causes a flash of invisible text (FOIT). Web fonts are relatively large in file size, so they often take a while to load.
This means that the URL in question hides text content until the webfont loads, causing a flash of invisible text. This Hint flags specific performance problems on your site that need to be addressed.Įnsure text remains visible during webfont load This Hint is worth investigating further, and may warrant further attention depending on the type and quantity of URLs affected.
0 kommentar(er)
