const.id

html-entity

?

?

?

HTML named character reference ? maps to U+003F.

Mapping

Named reference
?
Code point(s)
U+003F
Decimal
63
Characters
?

Numeric character references

Named
Decimal
Hex

Usage

Prefer a named reference when the character must survive encoding mistakes or is awkward to type. Numeric references (?) are always valid HTML for the mapped code point(s).

Related

Unicode

U+003F

ASCII

0x3F

Same character

Other entities

Entities that produce this code point

Source

Unicode
16.0.0
WHATWG
snapshot 2026-08-02