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Development Tools Introduction to Front End Performance Optimization Combine and Minify Assets Optimize JavaScript

Tony Gilem
Tony Gilem
189 Points
Posted by Tony Gilem
Tony Gilem
189 Points

Am I right

Does that mean that if the js file is on the bottom it will load for the user what is necessary to see, but in the meantime, it will still be loading before the user ever clicks on something javascript will be fully loaded that it will work?

1 Answer

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

In modern browsers, JavaScript loaded at the bottom of the page code will be loaded after the DOM is constructed in memory, but it will be run to completion before the page is rendered on the user's screen.

So when you see any buttons, all the JavaScript code (except anything asynchronous or event-driven) has already been done.