What are surrogates?
Surrogates, or surrogate pairs, are pairs of UTF-16 code values that encodes one special character such as an emoji.
Reference: https://unicode.org/faq/utf_bom.html#utf16-2
Chromium, Chrome and Edge
Starting with Chrome 152, emojis and surrogate pairs are supported.
Prior to Chrome 151, Chromium only supports BMP characters which includes 182 characters that could be treated as text or emojis depending on the surrogates.
Firefox and Safari
Emojis and surrogate pairs are supported.