[Webkit-unassigned] [Bug 165034] New: Page crash when you use use css custom properties with '%' inside a calc()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165034

            Bug ID: 165034
           Summary: Page crash when you use use css custom properties with
                    '%' inside a calc()
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: matteowebdesigner at googlemail.com

Created attachment 295339
  --> https://bugs.webkit.org/attachment.cgi?id=295339&action=review
Error you see

Issue found on:
- iPhone 5 Safari 9
- MacOs 10.12.1 Safari 9/10

to replicate the issue create an html page and add this: <div style="--size:%;width:calc(var(--size));"></div> 

The page will crash and report an error.

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