null vs undefined
Check the differences between these two.
Extend types
See what types can offer for us TypeScript.
Toggle checkbox message on click in pure CSS
Show and hide checkbox message on click using only CSS.
Validation form messages on keypress using pure CSS
Simple form inputs validation using pure CSS, without any JavaScript.
Enums in JavaScript
It is possible to create enums in JavaScript?
Promise all method
Combine all promises into one.
HTML details element
Simply show or hide content without any scripts.
form one liner resets
Check out how to reset form using JavaScript, jQuery or even raw HTML.
media query ranges – the width keyword
Write responsive css shorter and nicer.
prefers-color-scheme media query – what it is?
Check how to detect user system theme (light or dark) and apply appropriate styles.