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I am creating an email template, the specs that I am working to have the measurements in MS word font size. Being a print medium, this is in pt. However email is a screen based medium (https://stackoverflow.com/a/3557275/989852).
Should the font-sizes (and all other dimensions for that matter) in an email template be specified in pt or px?
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A pt is 1/72th of an inch and is a useless measure for anything that is rendered on a device which doesn't calculate the DPI correctly. This makes it a reasonable choice for printing and a dreadful choice for use on screen. A px is a pixel, which will map on to a screen pixel in most cases.
The answer used to be absolutely yes because, if you used px units, you prevented the text from being resized by the user at all. But browser zoom is the default method for making everything bigger (including text) these days and it works great even if you use px . But…
The standard email font size is 11 to 12 point, and for subheaders, 13 point works. You want it large enough to be read on desktop and mobile devices, but not so big that it comes across as shouting.
Pixel's are the preferred method to calculate font sizes in email signatures, because they need to be measured on LCD screens, rather than physically. Since computer and mobile devices all have LCD screens, it makes sense to use pixels as a unit of measurement.
(Excerpt: Paul Dyke - http://www.adestra.com/what-need-know-using-fonts-in-email/)
em doesn’t work with fonts in email as email clients have different default sizes.
% is another scalable font unit, similar to em except 100% will always equal the default size.
pt is sometimes used. One point is equal to 1/72 of an inch. But why use a unit that is a throwback to the printing industry?
In my opinion, pixels are the best option. Email designs are often pixel perfect – lots of sliced images in different table cells that have to appear seamless. Having your text behave in a similar way makes sense.
And it's also my opinion
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