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What is 12pt in CSS?
The web measures font-size in px , so in CSS you use px . pt however is a unit to measure font-size when printing is involved, and 16px are 12pt . The default browser font-size is 16px for instance, and in a lot of software like Microsoft Word where you can print out your documents, the default font-size is 12pt .Absolute length units

Unit	Name	Equivalent to
in	Inches	1in = 2.54cm = 96px
pc	Picas	1pc = 1/6th of 1in
pt	Points	1pt = 1/72nd of 1in
px	Pixels	1px = 1/96th of 1in

Points (pt) as CSS font size

Points are based on an inch on a ruler, and one inch is equal to 72 points. This unit also varies greatly between different browsers and screens when used in CSS.

Is pt the same as px : Points vs. Pixels

1 pixel (px) is usually assumed to be 1/96th of an inch. 1 point (pt) is assumed to be 1/72nd of an inch. Therefore 16px = 12pt.

What is 12 pt font

Each line of type has a height that is measured in points. In physical terms, a point is 1/72 of an inch, which means that 72-point type is an inch tall, and 12-point type is 1/6 of an inch.

How many pixels is 12pt : 16px
(and Ems and %)

Points	Pixels	Ems
12pt	16px	1em
13pt	17px	1.05em
13.5pt	18px	1.125em
14pt	19px	1.2em

1/72 of an inch

Points (pt): Points are traditionally used in print media (anything that is to be printed on paper, etc.). One point is equal to 1/72 of an inch.

In CSS, 1cm is roughly 37.8 pixels, or about 25.2/64 of an inch.

What is the font size 12

In typography and typesetting, font size is typically measured in points, where one point is equal to 1/72 of an inch. Therefore, a 12" font size means that the height of the characters is approximately 12 points, or 1/6 of an inch.4.233 mm
Comparison table

Point	Metric size	American system
American
11	≈ 3.881 mm	Small Pica
12	≈ 4.233 mm	Pica
14	≈ 4.939 mm	English

Type size is generally in points; a typographer's point is 1/72 in, and so you can get a measurement in inches by dividing by 72, and in mm by multiplying this last value again by 25.4. Your a at 12 pt should be 0.074 in/1.8796 mm wide when printed out, and in an 8′ width you can fit 8/0.074 ~ 108.1 a's.

In print, the optimal point size for body text is 10–12 point. On the web, the optimal size is 15–25 pixels. Though 12 point has become the default size in digital word processing—and also the basis of many institutional document-formatting rules—that's mostly due to the typewriter tradition.

What size is 12pt : 4.233 mm
Comparison table

Point	Metric size	American system
British
12	≈ 4.233 mm	Pica
14	≈ 4.939 mm	English
15	≈ 5.292 mm

How much is 1px in CSS : Devices change, but the px always has the same visual appearance. In fact, CSS requires that 1px must be exactly 1/96th of an inch in all printed output. CSS considers that printers, unlike screens, do not need to have different sizes for px in order to print sharp lines.

What is 1.5 line height in CSS

line-height: 1.5 (without units) will mutiply the element's font size by 1.5 to compute the line height. line-height: 150% will take 150% of the element's computed font size to compute the line height, which is equivalent to multiply it by 1.5 .

In print, the optimal point size for body text is 10–12 point. On the web, the optimal size is 15–25 pixels. Though 12 point has become the default size in digital word processing—and also the basis of many institutional document-formatting rules—that's mostly due to the typewriter tradition.So simply press the ctrl a to select your entire document. And then right here in the Home tab in the font. Section select Times New Roman if Times New Roman is not under a recently used font.