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.

It's better to use relative units, such as em, instead. The em and ex units depend on the font and may be different for each element in the document. The em is simply the font size. In an element with a 2in font, 1em thus means 2in.

Nov 14, 2024 · The em is based on the parent font size so that it can change in nested elements, while rem is based on the root font size, keeping the size same throughout the whole page. The em unit in CSS is relative to the font size of its parent element.

Jan 25, 2024 · This article will demonstrate the best use cases for each of these units. We'll focus on the most important and frequently used CSS units here: rem, em, vh, vw, %, and the all too familiar absolute unit – px. Table of Contents: Rem (rem) Em (em) Percentages (%) Viewport height (vh) Viewport width (vw) [ch](#heading-ch) Pixels (px) Rem (rem)

Feb 3, 2020 · In typography, the term em "was originally a reference to the width of the capital M in the typeface and size being used". When used with the font-size property, em inherits the font-size from its parent element: In this example, the font-size of p is 16px (16 1). Meanwhile, the font-size of h2 is 48px (16 3), and 32px for the h3 (16 * 2).

In CSS, the em unit is a general unit for measuring lengths (for example, page margins and padding around elements). You can use it both horizontally and vertically, and this shocks traditional typographers who have always used the em exclusively for horizontal measurements.

Aug 25, 2021 · Today we're gonna learn how to use the CSS units EM, REM, VW and VH by working through some practical examples. We'll also see how to make responsive websites with these units.

Aug 11, 2022 · In CSS, em is a relative unit for the size of the current element relative to the size of its parent. 1em corresponds to the exact size of the current element, 2em to double that size, 3em to triple that size, and so on.

Mar 14, 2012 · How to use em units in CSS, one of the most commone and powerful CSS units for creating scalable, flexible, and maintainable stylesheets.

Jan 10, 2024 · In this article we will discuss the purpose, advantages and use cases of EM units in CSS layout. What is em unit? em is a relative measurement unit that refers to font-size of the element it is used on (in some cases, the font-size of the parent element).