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Showing content from https://developer.mozilla.org/en-US/docs/Glossary/Escape_character below:

Escape character - Glossary | MDN

Escape character

An escape character is a character that causes one or more characters that follow it to be interpreted differently. This forms an escape sequence, which is often used to represent a character that has an alternative meaning when printed literally, such as the quote character in a string literal. Escape sequences can have other usages too, especially in regular expressions.

In JavaScript regexes, string literals, and identifiers, we can use the backslash (\) to escape characters like \', \", \u0026, etc.
In CSS identifiers, we can use the backslash (\) to escape characters like \\, \n, \26, etc. See escape characters for more information.
In HTML text content and attribute values, we can use character references like <, <, or <.
In URLs, we can use the percent sign (%) to escape characters like %20, %3C, %3E, etc.