This is something most web developers are not aware of: In no UI Software, not even the amazingly advanced ones like Sketch and Figma, we are currently able to design in rem/em units as UX/UI Designer. font-size of container 2rem= 32px thus 1em=32px inside the containerīut There Are No REM Units in Figma?! What Can I Do? root-font size = 16px then 1rem=16pxĮm → a multiple of the font-size of the element it is used on e.g.
Rem → a multiple of the root font-size of your browser (r stands or root) e.g. Now rem and em both refer to the root size, but they do not interpret it in the same way throughout your design. The beauty of it is that by using rem units for defining font-size, you keep the harmony and hierarchy of your type scale as a designer yet still granting flexibility for users’ needs to adapt font sizes. For the minority that relies on changing the root font-size, all text (and ideally all other elements but more about this later) would scale proportionally. The answer is, for all users not changing root font-size (which, no doubt, is the large majority), absolutely nothing changes and your design looks just as it would with px. So to answer our original question, “what changes in our design when using rem instead of px”. It not being a fixed value is the whole point of using it. REM does not translate into px as such, but you can calculate the px value based on your root font size. 1rem is 100% and 3 rem is the same as 300%. If it is easier for you, just think of it as %. So to translate our H1 of 48px to rem we calculate 48px/16px(default root size we assume)= 3rem.
Using rem units respects the user's browser settings Especially users user with vision impairment might rely on this! Try it out yourself Chrome → More Menu(three little dots, top right) > Settings > Appearance > Either custom font, or Font size both do the trick. Users can alter this root font-size via the browser setting. Font-Size Preference? What Is That?Įvery browser has a default root font size, which means unstyled text will be displayed in a certain size, usually 16px. Now a fixed value seems like a designer's dream, total control as we are designing at 1x in Figma! Fixing everything so it looks perfect! However, using px(besides other issues) can create serious accessibility barriers such as overruling the font size preferences set by users. Pixel are absolute units, meaning, that 1px corresponds to a fixed physical size(depending on different screen resolutions). Let’s get started: So What Is the Problem When Using PX Values?
Not quite (unless you interpreted “pixel perfect” as avoiding half-pixel). Surely it is correct, and if not, the development team can fix that, no? Plus, there are a lot of people saying my design should be pixel perfect, right? If you are anything like me, you happily used Pixel ( px) in Sketch and Figma during the past years without thinking much about it.
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