Lexical Grammar - ID_Start not applied to _ or $ (#36619)

files/en-us/web/javascript/reference/lexical_grammar/index.md

@@ -158,7 +158,10 @@ class C {
 lbl: console.log(1); // Label
 ```
 
-In JavaScript, identifiers are commonly made of alphanumeric characters, underscores (`_`), and dollar signs (`$`). Identifiers are not allowed to start with numbers. However, JavaScript identifiers are not only limited to {{Glossary("ASCII")}} — many Unicode code points are allowed as well. Namely, any character in the [ID_Start](https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=%5Cp%7BID_Start%7D) category can start an identifier, while any character in the [ID_Continue](https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=%5Cp%7BID_Continue%7D) category can appear after the first character.
+In JavaScript, identifiers are commonly made of alphanumeric characters, underscores (`_`), and dollar signs (`$`). Identifiers are not allowed to start with numbers. However, JavaScript identifiers are not only limited to {{Glossary("ASCII")}} — many Unicode code points are allowed as well. Namely:
+
+- Start characters can be any character in the [ID_Start](https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=%5Cp%7BID_Start%7D) category plus `_` and `$`.
+- After the first character, you can use any character in the [ID_Continue](https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=%5Cp%7BID_Continue%7D) category plus U+200C (ZWNJ) and U+200D (ZWJ).
 
 > [!NOTE]
 > If, for some reason, you need to parse some JavaScript source yourself, do not assume all identifiers follow the pattern `/[A-Za-z_$][\w$]*/` (i.e. ASCII-only)! The range of identifiers can be described by the regex `/[$_\p{ID_Start}][$\u200c\u200d\p{ID_Continue}]*/u` (excluding unicode escape sequences).