![]() This is because fonts are expected to be fetched anonymously by the browser, and the preload request is only made anonymous by using the this attribute. Note that the use of crossorigin here is important without this attribute, the preloaded font is ignored by the browser, and a new fetch takes place. When using custom fonts you should tell the browser to preload them using the appropriate rel="" tag and attributes: ![]() These are the only two file types you should use because they are compressed in the gzip format by default (so they are very small), are optimised for the web, and are fully supported by IE 9+ and all other evergreen browsers. There are many font formats that can be used on the web, but only two formats are really needed if you don’t have to support Internet Explorer (IE) 8 or lower: woff and woff2. Let’s break down these points one at a time. Avoid invisible text during font loading.There are just four steps to consider when loading a custom web font: It’s time to break this loop and start doing the right thing in 2019. I see many developers ignoring these issues or perhaps making the same errors over and over just because “they have always done so”, but as web developers we need to be able to adapt in a constantly changing environment. This causes a lot of problems for page loading like performance issues, slow loading time, blocked rendering and swapped fonts during navigation. For fonts loaded from a provider that does not support the current browser, the fontinactive event will be triggered.Custom web fonts are used everywhere around the world, but many (oh so many) sites load them improperly. When finished, the active event will be triggered.įor fonts loaded from supported providers, the fontactive event will be triggered. If Web Font Loader determines that the current browser can support and at least one provider is able to serve fonts, the fonts from that provider will be loaded. When loading fonts from multiple providers, each provider may or may not support a given browser. ![]() If Web Font Loader determines that the current browser does not support the inactive event will be triggered. Web font providers can build on top of the basic Web Font Loader functionality to handle these special cases individually. The Web Font Loader is not designed to handle these cases and it defaults to believing what's in the user agent string. In this case a web font provider may decide to send WOFF fonts to the device because the real desktop Chrome supports it, while the mobile browser does not. This is especially noticeable on mobile browsers with a "Desktop" mode, which usually identify as Chrome on Linux. The user agent string may claim to support a web font format when it in fact does not. Browser SupportĮvery web browser has varying levels of support for fonts linked via Web Font Loader determines support for web fonts is using the browser's user agent string. If you're using Typekit, you should use their embed codes directly unless you also need to load web fonts from other providers on the same page. The following classes are set on the html element:įYI: Typekit's own JavaScript is built using the Web Font Loader library and already provides all of the same font event functionality.
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