blocking="render"The blocking="render" attribute for <link>, <script>, and <style> elements blocks rendering until the external script or stylesheet has been loaded. For <link rel="expect">, rendering is blocked until a specific element is in the DOM.htmlHTMLlimitedhttps://html.spec.whatwg.org/multipage/urls-and-fetching.html#blocking-attributeshttps://developer.mozilla.org/docs/Web/API/HTMLLinkElement/blockingapi.HTMLLinkElement.blockingapi.HTMLScriptElement.blockingapi.HTMLStyleElement.blockinghtml.elements.link.blockinghtml.elements.script.blockinghtml.elements.style.blockinghttps://nowyoucanuse.com/features--blocking-render.html