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. fontinactive - This event is triggered if the font can't be loaded.ĬSS events are implemented as classes on the html element.fontactive - This event is triggered once for each font that renders.fontloading - This event is triggered once for each font that's loaded.inactive - This event is triggered when the browser does not support linked fonts or if none of the fonts could be loaded. ![]() ![]() active - This event is triggered when the fonts have rendered.loading - This event is triggered when all fonts have been requested.It gives you notifications of the font loading sequence in both CSS and JavaScript. Web Font Loader provides an event system that developers can hook into. When using the asynchronous approach, you must define the global variable WebFontConfig before the code that loads the Web Font Loader (as in the example above). It defines which fonts to load from each web font provider and gives you the option to specify callbacks for certain events. ![]() The Web Font Loader configuration is defined by a global variable named WebFontConfig, or passed directly to the WebFont.load method.
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