In WordPress 6.4, script loading strategies are now being employed for frontend scripts in core and bundled themes. For more information, refer to the dev note on Registering scripts with async and defer attributes in WordPress 6.3. In WordPress 6.3, the script loading strategies were introduced ( #12009), enabling scripts to finally have an API for marking them to be printed with async or defer without resorting to filtering script_loader_tag (or worse clean_url, per below). to inject defer and async attributes plugins should now use the script loading strategies API API An API or Application Programming Interface is a software intermediary that allows programs to interact with each other and share data in limited, clearly defined ways. Unlike Actions, filters are meant to work in an isolated manner, and should never have side effects such as affecting global variables and output. They provide a way for functions to modify data of other functions. This change also has back-compat implications for the obsolete use of the clean_url filter Filter Filters are one of the two types of Hooks. Additionally, scripts on the frontend and login screen are now constructed using script helper functions, making it possible to utilize Content Security Policy to harden against any XSS vulnerabilities. and bundled themes to improve performance of loading scripts with defer and async attributes. The Core Development Team builds WordPress. Script loading strategies are now employed in core Core Core is the set of software required to run WordPress.
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