JS: Expressions and operators

This chapter describes JavaScript expressions and operators, including assignment, comparison, arithmetic, bitwise, logical, string, and special operators.

JS: Values, variables, and literals

Absolute Horizontal And Vertical Centering In CSS

We’ve all seen margin: 0 auto; for horizontal centering, but margin: auto; has refused to work for vertical centering… until now! But actually (spoiler alert!) absolute centering only requires a declared height* and these styles: More detail

How to make vertical middle alignment

With just 3 lines of CSS (excluding vendor prefixes) we can with the help of transform: translateY vertically center whatever we want, even if we don’t know its height. The CSS property transform is usally used for rotating and scaling elements, but with its translateY function we can now vertically align elements. Usually this must be done with absolute positioning or setting line-heights, but these require you to either know the height of the element or only works on single-line text etc. More detail