Blocking=render: Why would you do that?

WebKit has announced the implementation of the blocking=render attribute, which will prevent the parsing and rendering of subsequent content until a specified script, such as app.js, is fully fetched and parsed. This approach contrasts with the default behavior of other file types, which are non-blocking. The blocking=render attribute aims to improve user experience by avoiding the issues associated with anti-flicker snippets, which render pages invisibly before making them visible, potentially leading to user interaction with invisible elements. By allowing the browser to manage rendering, blocking=render facilitates a progressive rendering process, enhancing the overall experience. However, it introduces a risk of longer render-blocked periods, as the timeout for rendering is now determined by the browser's heuristics rather than a fixed duration. While blocking=render may not be necessary for all users, it provides a solution for those who require it, ensuring that content is not prematurely displayed.

- WebKit's blocking=render attribute prevents rendering until scripts are fully loaded.

- This method improves user experience by avoiding invisible page interactions.

- It allows for progressive rendering, enhancing overall site performance.

- The timeout for rendering is now based on browser heuristics, potentially increasing render-blocked periods.

- Not all users will need blocking=render, but it serves a specific purpose for those who do.