![]() This is a key advantage of using relative units. If we set html, this will affects only the s with relative font size units. The difference between absolute and relative units can be highlighted by altering the html font size. This means that if you set the font size of one to 100% and another to 16px, they will render as the same size on screen. In most browsers, the default font size for the html and body tags is 100%. In a blank HTML document, without you declaring any font sizing, there are default settings used. ![]() The difference between these units can be difficult to understand conceptually, so it is best to demonstrate their differences with practical examples. You can see an exhaustive list of units here, but I will focus on what I think are the most relevant units - px, pt, %, em, rem, and vw. Xx-small, x-small, small, medium, large, x-large, xx-largeġ/100th of the viewport’s smaller dimension (height or width)ġ/100th of the viewport’s larger dimension (height or width) Relative to the parent element’s font size Here is a brief overview of some of the units - Unit This means that their size can be altered by changing the sizing of that dependent element. Instead, their actual size is determined by the size of a parent element. ![]() Relative units do not have an objective measurement. Once they are declared, their size cannot be altered by changing the font size of some other element. Broadly speaking, the units fall into one of two categories - absolute and relative.Ībsolute units are fixed and (mostly) relate to some physical measurement. There are several different ways you can declare the size of a font in CSS. Following on from last week's article in which I briefly discussed css pixel sizing, I decided to look into the different ways you can declare your font size with CSS.
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