2/21/2023 0 Comments Html fontyAdd a way to store these custom values (using either a database, cookies or local storage) and you have the base of a personalization system based on user preferences. This time the user has control over the size of the interface, adjusting it to fit his needs. In the second example we do the same alteration using JavaScript. See the Pen Dynamic Sizing of Modules with Rem Units by SitePoint ( on CodePen. As element padding values and margins are expressed using rem, the entire component scales with the device size. Just like in the previous section, the purpose is to customize the reading experience for the device used. In this first example, we change the root font size using media queries. Using rem Units for Scaling Documents Demo #1 Continuing with our example above, let’s change the font size of a paragraph to 26 pixels with CSS. Then add this style attribute to an HTML element, like a paragraph, heading, button, or span tag. Set it to the value you want and place it inside a style attribute. Let’s see how this thing works using a couple of examples. To change font size in HTML, use the CSS font-size property. By expressing widths, margins, and padding in rem units, it becomes possible to create an interface that grows or shrinks in tune with the root font size. Zurb Foundation (currently at v6.5.3 at the moment this was written) makes use of em units in the media queries.Ī third use we can find for rem units is to build scalable components. The only way to change the media query breakpoint values is to modify the default font size in the browser settings.įor this reason, it doesn’t really matter if we use em or rem units for media query breakpoints. None of the font-size changes we declared had any effect on the breakpoints. This form has the default HTML form behavior. As we change the width of the browser window we can see that the first media query kicks in at 320px (20 × 16px) while the second one becomes active at 480px (30 × 16px). .We begin with the 62.5% trick to show that the modified root font size does not have any effect on the values used for the media queries. It was not a new discovery, by any means, as it was already used with em units: body ) For this reason, Snook used a trick called “ 62.5%“. Let’s see an example of some common font sizes expressed in rem units, assuming, of course, that the base size is 16px:Īs we can see, these values are not very convenient for making calculations. The main issue with using rem for font sizing is that the values are somewhat difficult to use. However, as we saw earlier, it is very easy to lose track of nesting and get unexpected results with em units. Like many other CSS developers, he had to face the problems that em units bring in complex layouts.Īt that time, older versions of IE still had large market shares and they were unable to zoom text that was sized with pixels. One of the pioneers of using rem units for font sizing is Jonathan Snook with his Font sizing with REM article, back in May, 2011.
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