![]() ![]() You'd think that EM was an acronym or an abbreviation, but it is not. So, 200% would be double the current font size. It increases or decreases the current font size by a given percentage. ![]() Percent does exactly what you would expect. To allow the fonts and the spacing around it to scale to the user settings, you should use relative units of measurement such as REM, EM or percent. The same way you would draw a line the same length every time if I told you to draw it 16mm long. The browser will literally draw the font to that static size. Think of it as 16 physical dots on the screen, it might slightly more or slightly less depending on the screen you're using, but it's always going to draw it out the same size, every time.Īt the time of writing this, whatever you change your font size to in the browser settings will have no effect on pixel measurements, and that's where the accessibility issues occur. So, if you set the font size to be 16px in your CSS, it is always going to be rendered out to the same hight on the screen. But, the important part to think about is that they are calculated based on the physical screen you're using, rather than the settings in your browser. There's a lot of science goes into how big a browser will actually render heights and widths in pixels. Ok, they're not truly static like metres or miles. A simplified way of thinking about pixels is that 1px is equal to 1 dot on the screen you're currently using. If the website is coded badly, then it will override the useful settings in the browser and make it inaccessible for some users. This means developers have a responsibility to code websites properly. If it didn't, all websites would look the same. ![]() The browser will always prioritise the website CSS. The reason it might look like a broken setting on some websites is that the browser gets its initial instructions from the user settings, but it gets the rest of its instructions from the website you're viewing. However, depending on the websites you're browsing, you might not actually see it work. If you're using chrome and you type chrome://settings into the address bar, then search for 'font size', you will see that you can set it to various sizes. UAAG is similar to WCAG, but it focuses on the tool being used to view the website, rather than the website itself. This is part of the User Agent Accessibility Guidelines (UAAG). Using the wrong units of measurement in your Cascading Style Sheets (CSS) can be a barrier for many visually impaired users.Īll modern browsers allow people to override the default font size in the user settings. It's now 2022, and I'm still seeing far too many websites using static pixel sizes for fonts. ![]()
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