This rule is triggered when PageSpeed Insights detects that a Web page contains an external style sheet that prevents rendering, which delays the display of content on the screen.
如果外部CSS資源較小,您可以直接將這些內(nèi)容插入到HTML文檔中,這稱為“內(nèi)嵌”。通過這種方式內(nèi)嵌較小CSS資源,瀏覽器可以繼續(xù)呈現(xiàn)網(wǎng)頁。請注意,如果CSS文件較大,完全內(nèi)嵌CSS可能會導(dǎo)致PageSpeed Insights通過按優(yōu)先級排列可見內(nèi)容Warn you that the first screen of the web page is too large. If the CSS file is large, you need to identify and embed the CSS needed to render the first screen content, and hold off loading the remaining styles until the first screen content is displayed.