N.B This will prevent the user from being able to set a smaller preferred font size. The wording is confusing as we’re using max to set a minimum font-size but the idea is it’s picking the larger of the values set here. Where it’s supported this will reset the font size to user preference 1rem with a minimum size of 16px to adjust for small default root sizes. I’m going to look at these values in reverse order as that’s what the priority order is font-size:max(16px, 1rem) Ideally we want to return the font size to 1rem however some email clients don’t support rem and in some the default value can be very small (12px in Applemail) so we will set a minimum and some fallbacks.
But also setting a default font-size on the parent wrapping element to improve consistency and accessibility.
#Using css in html email signature outlook full#
Unfortunately rem units don’t yet have full support in email clients so for now I’m recommending using em units inside the email. When used for other setting such as padding, margin, etc. * Samsung sets a minimum font-size of 17px so these values of 16px only work when used to generate font-size greater than or wqual to 17px. It’s worth noting that some of these defaults do change with the user settings already. Inherited this is inherited from the email client styles, equivalent to adding plain text without any stylijng.Root this is the root font-size, mostly this woudlbe the same as the default but could be overridden by the email client style’s, equivalent to using font-size: 1rem.Default this is the default value in the user setting, equivalent to using font-size: medium.I have seen a few inconsistencies between tests I’ve run locally and via Litmus. This is just to be used as a rough guide to show the range of sizes found. Looking at popular email clients it ranges between 12px and 17px Default font size for email clients However, the default size in clients tends to vary a bit more. In the majority of web browsers the default value is 16px as this is a good readable font size for most people. What is the default value of 1rem / medium This only works if we respect their settings and base our font-size on the rem set by the user. So if someone finds small text hard to read they can make it larger in the user settings and it will apply across the whole email. This root font size can be changed by the user, this is done in the email clients, browser or operating system preferences. Rem units are similar to em however these values are relative to the :root font size rather than the current font size so the value doesn’t change. If you were then to change that to font-size: 20px for a heading, 1em would be equal to 20px. So if you have a font-size:16px set then 1em would be equal to 16px. What are EM units and REM unitsĮm units are equal to the current font size, the name comes from the width of an uppercase M. Then smaller and larger will adjust relative to the parent font size. medium is the default (equal to 1rem), then small large x-large xx-large etc. There are also keyword values which are a bit of a mix of the relative and absolute.
These include vw(viewport width), vh(viewport height), lh(current line height) and more but the ones we’re interested in for accessibility are rem and em. Relative units are more flexible as they are based of something else. These include px(pixels), pt(points), pc(picas), cm(centimetres), in(inches) and more. There are a number of different units that can be used to set sizes in CSS these can be grouped into absolute and relative.Ībsolute units don’t ever change and are good for consistency but lack flexibility. Last Updated: 10 th May 2022 Using rem and em units in email
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