drop-initial-before-adjustプロパティ

Value：before-edge | text-before-edge | central | middle | hanging | mathematical | <percentage> | <length>
Initial：text-before-edge
Applies to：::first-letter pseudo element
Inherited：no
Percentages：refer to combined line height size as provided by drop-initial-value
Media：visual
Computed value：specified values (except for initial and inherit)