@@ -1704,8 +1704,14 @@ Type Checking</h4>
17041704 <<angle>> ,
17051705 <<time>> ,
17061706 <<percentage>> ,
1707- <<number>> , or
1708- <<integer>> .
1707+ or <<number>> .
1708+ It can be used anywhere its [=resolved type=] is allowed.
1709+
1710+ Additionally, [=math function=] whose [=resolved type=] is <<number>>
1711+ can be used in any place that only accepts <<integer>> .
1712+ (It gets rounded to the nearest integer,
1713+ as specified in [[#calc-range]] .)
1714+
17091715 The <a>resolved type</a> must be valid for where the [=math function=] is placed;
17101716 otherwise, the expression is invalid.
17111717
@@ -1818,7 +1824,7 @@ Type-Checking Expressions</h5>
18181824 If the result is failure,
18191825 the entire [=math function=] is invalid.
18201826
1821- A [=math function=] resolves to <<length>> , <<angle>> , <<time>> , <<frequency>> , <<resolution>> , <<flex>> , or <<percentage>>
1827+ A [=math function=] resolves to <<number>> , << length>><<angle>> , <<time>> , <<frequency>> , <<resolution>> , <<flex>> , or <<percentage>>
18221828 according to which of those productions its [=CSSNumericValue/type=] [=CSSNumericValue/matches=] .
18231829 (These categories are mutually exclusive.)
18241830 If it can't [=CSSNumericValue/match=] any of these,
@@ -1923,6 +1929,12 @@ Range Checking</h4>
19231929 Note: This requires all contexts accepting ''calc()''
19241930 to define their allowable values as a closed (not open) interval.
19251931
1932+ Additionally, if a [=math function=] whose [=resolved type=] is <<number>>
1933+ is used somewhere that only accepts <<integer>> ,
1934+ the [=computed value=] and [=used value=] are rounded to the nearest integer,
1935+ in the same manner as clamping, above.
1936+ The rounding method must be the same as is used for animations of integer values.
1937+
19261938 <div class=example>
19271939 Since widths smaller than 0px are not allowed,
19281940 these three declarations are equivalent:
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