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HTML’s New Blocking Attribute

the newly introduced blocking attribute in HTML, which allows developers to control render-blocking behavior more effectively.

Key Points:​

  • Render-Blocking Challenge: Traditionally, <script> tags without async or defer attributes halt HTML parsing, blocking page rendering until the script loads, which can slow down user experience.

  • Purpose of the blocking Attribute:

    • Clarifies Developer Intent: It helps clarify the intended blocking behavior, reducing unintended consequences during code changes.
    • Compatibility with defer and async: The blocking attribute enables developers to manage rendering without interfering with HTML parsing.
    • Control Over Module Scripts: It allows <script type="module"> to achieve render blocking as well.

Overall, the blocking attribute enhances control over how resources affect rendering, improving web performance and developer experience.