[Webkit-unassigned] [Bug 195173] New: [css-values-4] calc() with out-of-range value must be clamped within range allowed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195173

            Bug ID: 195173
           Summary: [css-values-4] calc() with out-of-range value must be
                    clamped within range allowed
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: browserbugs2 at gtalbot.org

CSS4 Values and Units, section 9.1.4. Range Checking
https://www.w3.org/TR/css-values-4/#calc-range
states

"
Parse-time range-checking of values is not performed within math functions, and therefore out-of-range values do not cause the declaration to become invalid. However, the value resulting from an expression must be clamped to the range allowed in the target context. Clamping is performed on computed values to the extent possible, and also on used values if computation was unable to sufficiently simplify the expression to allow range-checking.
"


Test
----

testing tab-size: calc(2 * -4) in
http://w3c-test.org/css/css-values/calc-numbers.html


Expected result
- - - - - - - -

document.defaultView.getComputedStyle(elemTarget)["tab-size"] == "0"


Test result
- - - - - -

https://wpt.fyi/results/css/css-values/calc-numbers.html?label=master

{ but got "12345" }

This seems to suggest that Safari 76 preview treats the declaration as invalid instead of performing clamping on computed value.


Epiphany Technological Preview 3.31.90-45-ga15d70306 using WebKitGTK 2.23.3 also fails that test in the same manner.

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