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The actual, physical height of any given portion of the font depends on the user-defined DPI setting, current element font-size, and the particular font being used. To make style rules that depend only on the default font size, another unit was developed: the rem. The rem «rem unit», or root-em, is the font size of the root element of the ...
Download as PDF; Printable version; ... A height of 4 is triple spacing between lines: {{line-height|4 ...
Thus, the exact ratio of ex to em can vary by font size within a browser if the determined values are rounded to the nearest whole unit. For example, a browser calculating an x-height of 45% on a font 10 pixels tall may round ex to either 4 pixels or 5 pixels or leave it at 4.5 pixels.
The point was first established by the Milanese typographer, Francesco Torniella da Novara (c. 1490 – 1589) in his 1517 alphabet, L'Alfabeto.The construction of the alphabet is the first based on logical measurement called "Punto," which corresponds to the ninth part of the height of the letters or the thickness of the principal stroke.
Download QR code ; Print/export ... because they can be manipulated by the reader or overridden by an author if your CSS is ... margin-top: 1em; margin-bottom: 0 ...
The Cascading Style Sheets (CSS) specification describes how elements of web pages are displayed by graphical browsers. Section 4 of the CSS1 specification defines a "formatting model" that gives block-level elements—such as p and blockquote—a width and height, and three levels of boxes surrounding it: padding, borders, and margins. [4]
The first version of CSS HTML Validator was released in 1997 for Windows 95. The current version is 2025/v25.01 [2] (as of January 24, 2025) and is for Windows 10 and above, including Windows 11. A native macOS and Linux command line version (called htmlval) became available with version 23. There are currently three main editions of CSS HTML ...
The first comprehensive draft of a grid layout for CSS was created by Phil Cupp at Microsoft in 2011 and implemented in Internet Explorer 10 behind a -ms-vendor prefix.The syntax was restructured and further refined through several iterations in the CSS Working Group, led primarily by Elika Etemad and Tab Atkins Jr.