HTML's Adding Special Mark To Letter

A diacritical mark is a "glyph" added to a letter.

Some diacritical marks, like grave (  ̀) and acute (  ́) are called accents.

Diacritical marks can appear both above and below a letter, inside a letter, and between two letters.

Diacritical marks can be used in combination with alphanumeric characters to produce a character that is not present in the character set (encoding) used in the page.

Here are some examples:

MarkCharacterConstructResult
 ̀aà
 ́aá
̂aâ
 ̃aã
 ̀OÒ
 ́OÓ
̂OÔ
 ̃OÕ

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