The text-combine-upright property specifies the combination of multiple typographic character units into the space of a single typographic character unit.
object.style.textCombineUpright = "value";
<'text-combine-upright'> = none | all | [ digits <integer>? ]
No special processing.
Attempt to typeset horizontally all consecutive typographic character units within the box such that they take up the space of a single typographic character unit within the vertical line box.
Attempt to typeset horizontally each maximal sequence of consecutive ASCII digits (U+0030–U+0039) that has as many or fewer digits than the specified integer such that it takes up the space of a single typographic character unit within the vertical line box. If the integer is omitted, it computes to 2. Integers outside the range 2-4 are invalid.
Specifies one or more decimal digits (0-9).
World Wide Web Consortium (W3C)