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Declarations such as text-indent: 1.5em and margin: 1em are extremely common in CSS. The ex unit is rarely used. Its purpose is to express sizes that must be related to the x-height of a font. The x-height is, roughly, the height of lowercase letters such as a, c, m, or o.
1em is equal to the current font size. The default text size in browsers is 16px. So, the default size of 1em is 16px. The size can be calculated from pixels to em using this formula: pixels/16=em
Dec 14, 2021 · Basically 1em equals the inherited font-size on the current element. e.g. You can set font-size for your body element, and have all other elements use 'em' in their font-size and it will be relative to the size you set in the body.
For low-dpi devices, 1px is one device pixel (dot) of the display. For printers and high resolution screens 1px implies multiple device pixels. Relative Lengths. Relative length units specify a length relative to another length property. Relative length units scale better between different rendering medium.
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.
Apr 16, 2009 · Here’s the scoop: 1em is equal to the current font-size of the element in question. If you haven’t set font size anywhere on the page, then it would be the browser default, which is probably 16px. So by default 1em = 16px. If you were to go and set a font-size of 20px on your body, then 1em = 20px.
Aug 29, 2023 · By extension, a font-size of 1em equals the computed font-size of the element on which it is used. If a font-size has not been set on any of the <p> 's ancestors, then 1em will equal the default browser font-size, which is usually 16px. So, by default 1em is equivalent to 16px, and 2em is equivalent to 32px.
