REM
Rem may refer to any of the following:
1. Short for remark, REM is a statement placed in system files such as the autoexec.bat to skip lines from loading. A remark is created by placing "REM" (followed by a space) in front of a line. Doing this remarks the line from loading and with batch files also doesn't show the line if echo is off.
@echo off
REM Example line that cannot seen with echo off.
Echo Hello World!
In the example above, the first line would be skipped, and the batch file would merely echo "Hello World!" to the screen.
Alternatively, you can place two colons (::) in front of a line to remark a line in a batch file. The line will not show with two colons regardless of whether the echo off is in the batch file.
::This line is never seen
Echo Hello World!
2. In CSS (Cascading Style Sheets) and typography, rem is short for "root em" and is a measurement relative to the root tag (<html>) element's font size. For example, if the page's root font size is 16px, 1rem equals 16px, 0.5rem (half) equals 8px, and 2rem (double) equals 32px.
If the root tag has no value, it is often 16px by default.
Using rem instead of em or px for elements like your headings helps with scaling and keeping your page layout consistent across all screen sizes. Below is an example of the H1 font-size setting being set in CSS using a rem measurement.
h1 {
font-size:2rem;
}
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