Async and Defer Attributes - How to Use Them to Speed Up Page Loading
The article on FreeCodeCamp discusses the impact of the 'async' and 'defer' attributes on the performance of JavaScript script loading in web browsers. It begins by explaining the differences between these two attributes. 'Async' allows scripts to load in parallel, meaning that a script can be downloaded while the page is still loading, but it does not wait for the loading to complete. In contrast, 'defer' defers script execution until the entire page has been loaded, ensuring that the DOM elements are available for manipulation. The author emphasizes that using these attributes can significantly improve page load times and the overall performance of web applications. In the concluding remarks, the use cases for each attribute are discussed, highlighting their importance in the context of modernizing web pages. The article also includes practical examples that help clarify how to implement these techniques in web projects.