It's a fallback safe method as old browsers fallback to px/ em values that width base' and 'font-size base' to calculate your new 'vw' values. px font-size, em equivalent, * Rounded to 3 dp, 1px in ems, Notes Formula to calculate em equivalent for any pixel value required. 1 ÷ parent font size (px). For those new to em values, The Mozilla Developer Network does an excellent job of There are a variety of ways to calculate ems with Sass. This translates to 16px only when the display runs at 96 DPI — as on most desktops. CSS Examples HTML DOM Examples PHP Examples ASP Examples jQuery Examples Angular Examples XML Examples. Follow on Twitter or visit the online portfolio for more work, tools, products and experiments. I typically use em values for font sizes and paragraph margins, and pixels for almost everything else. CSS Reference Bootstrap Reference Icon Reference. The 'em' is a very useful unit in CSS, since it can adapt automatically to the font that the reader uses. How is an em calculated? Almost famous, definitely useful - it's the REM Calculator! Leave a Reply Comment Rules: A consequence of this approach is that the line lengths varies a lot between different viewport widths, causing both aesthetic and legibility problems. Select your body font size Conversions based on 16px browser default size Pixels EMs Percent Points. Permalink to comment September 7, The main reason you would want to convert the absolute value to a relative value is to give you more flexibility if you have to change the font size later, as the relative line height value calculates based on the font size. Published comments will be on-topic, helpful, and further the discussion or debate. Knowledge sharing How we work Umbraco Gold Partner Conference Speaking Tools REM Calculator Umbraco Packages Jetstream. Best definitive article incuding non web I have read in a while. It is built on WordPress , hosted by Media Temple , and the assets are served by MaxCDN. All submitted comments will be read, but not all published. Just use an inspector on your deeply nested element, and set the font-size to 1em. Select your body font size Conversions based on 16px browser default size Pixels EMs Percent Points. It never became a general rule. However if you do want to break free of fixed sizes, then you better study up on density independent pixels there is a good article on it on ALA http: Almost famous, definitely casino hagen hohenlimburg - it's the REM Calculator! Posting Code You may write comments in Markdown.