Understanding these periods means you can use font-display to decide how your font should render depending on whether or when it was downloaded.Moments ago we introduced the Google Font API and Google Font Directory. Otherwise, the font face is used normally. If the font face is not yet loaded when this period starts, it's marked as a failed load, causing normal font fallback. The font failure period occurs immediately after the font swap period.If the font face successfully loads during the swap period, the font face is then used normally. During this period, if the font face is not loaded, any element attempting to use it must instead render with a fallback font face. The font swap period occurs immediately after the font block period.If the font face successfully loads during the block period, the font face is then used normally. During this period, if the font face is not loaded, any element attempting to use it must instead render with an invisible fallback font face. The first period is the font block period. Webfont loader download#Similar to the existing font timeout behaviors that some browsers implement, font-display segments the lifetime of a font download into three major periods: However, you can tell modern browsers how you want them to behave by using font-display. In the post Avoid invisible text during font loading you can see that default browser behavior is not consistent. You still need to consider how browsers behave when rendering text that uses a font-family which is not yet available. While preloading makes it more likely that a WebFont will be available when a page's content is rendered, it offers no guarantees. Using will trigger a request for the WebFont early in the critical rendering path, without having to wait for the CSSOM to be created. If there's a high probability that your page will need a specific WebFont hosted at a URL you know in advance, you can take advantage of resource prioritization. The "race" between the first paint of page content, which can be done shortly after the render tree is built, and the request for the font resource is what creates the "blank text problem" where the browser might render page layout but omits any text.īy preloading WebFonts and using font-display to control how browsers behave with unavailable fonts, you can prevent blank pages and layout shifts due to font loading.
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