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Links, ideas, news roundup #3

Why should you have a side project as a javascript developer

Working with read-only or immutable objects in Javascript

How to load a CSS file async

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[Js-Craft #20] Javascript Intersection Observer, loading scripts with defer or async, CSS srcset and box-sizing

What is box-sizing in CSS

Javascript Intersection Observer API – removing the listener, watching only for half of the element, changing the viewport

Using the Javascript Intersection Observer API to improve performance

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Responsive images – when to use x or w units in the img srcset

Set a time budget for your tasks and don’t be afraid to ask for help