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https://www.w3schools.com/CSSref/css_units.asp
CSS Units. CSS has several different units for expressing a length. Many CSS properties take "length" values, such as width, margin, padding, font-size, etc.. Length is a number followed by a length unit, such as 10px, 2em, etc.
https://www.w3schools.com/cssref/css3_browsersupport.asp
CSS Reference With Browser Support. The table below lists all CSS properties and how each property is supported in the different browsers: The number to the right of the browser icon indicates in which browser version the property was first supported.
https://davidwalsh.name/css-supports
Apr 03, 2013 · Great that you can check CSS support via either method -- it avoids property checking on transient nodes and string-building to check for support. Before using the JavaScript method of supports, it's important to detect the feature first. Opera uses a different method name so …
https://en.wikipedia.org/wiki/CSS_support
This article compares Cascading Style Sheets (CSS) support for several browser engines Explanation of the tables. Engine Status Embedded in WebKit: Active Safari browser, plus all browsers hosted on the ... (not limited to em, try any non-pixel units). transparent — Keyword is ignored when used with the outline-color property.
https://developer.mozilla.org/en-US/docs/Web/CSS/@supports
The @supports CSS at-rule lets you specify declarations that depend on a browser's support for one or more specific CSS features. This is called a feature query. The rule may be placed at the top level of your code or nested inside any other conditional group at-rule.
https://www.w3.org/Style/Examples/007/units.en.html
Use em or px for font sizes. CSS inherited the units pt (point) and pc (pica) from typography. Printers have traditionally used those and similar units in preference to cm or in. In CSS there is no reason to use pt, use whichever unit you prefer. But there is a good reason to use neither pt nor any other absolute unit and only use em and px.
https://templates.mailchimp.com/resources/email-client-css-support/
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https://www.w3.org/Style/LieBos3e/em
The meaning of em has changed over the years. Not all fonts have the letter M in them (for example, Chinese), but all fonts have a height. The term has therefore come to mean the height of the font – not the width of the letter M.. In CSS, the em unit is a general unit for measuring lengths (for example, page margins and padding around elements).
https://developer.mozilla.org/en-US/docs/Web/API/CSS/supports
Mar 18, 2019 · The CSS.supports() method returns a Boolean value indicating if the browser supports a given CSS feature, or not.. Syntax CSS.supports(propertyName, value); CSS.supports(supportCondition); Parameters. There are two distinct sets of parameters. The first one allows to test the support of a pair property-value:. propertyName A DOMString containing the name of the CSS property to check.
https://www.impressivewebs.com/understanding-em-units-css/
Mar 14, 2012 · Due to developers' habitual reliance on pixel values, I think some of us may not have a full understanding of what the em unit is, and how it works in CSS. As is the case with many topics I write about, I'll probably learn a thing or two while writing this. So I hope this will serve as a nice summary of what em units are all about and how you can use them in your designs.
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