[Webkit-unassigned] [Bug 91192] New: [Forms] input type="number" doesn't causes step mismatch when step >= 2^24

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=91192

           Summary: [Forms] input type="number" doesn't causes step
                    mismatch when step >= 2^24
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://jsfiddle.net/3c9D7/
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yosin at chromium.org


In StepRange.cpp, acceptable error is defined as step / 2^FLT_MANT_DIG, where FLT_MANT_DIG = 24.
And, stepMismatch() returns true when acceptableError < remainder < (step - acceptableError).

Here is example calculation:

value = 2^24+1
step=2^24
acceptable error = 1
remainder=1

Then
stepMismatch = false since remainder(1) == acceptableError(1)

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