[Webkit-unassigned] [Bug 160860] New: backface-visibility style not applied when printing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160860

            Bug ID: 160860
           Summary: backface-visibility style not applied when printing
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nathan at maxmo.net

Created attachment 286081
  --> https://bugs.webkit.org/attachment.cgi?id=286081&action=review
HTML and CSS to reproduce issue

The backface-visibility option does not affect the rendering of the page when printed.

I originally found this issue while trying to print search results from DuckDuckGo that include places:

https://duckduckgo.com/?q=boston+restaurants&ia=places

Through some subsequent digging, I found that the -webkit-backface-visibility property was no longer hiding content when printing the page. As a result, this causes text that is hidden on screen to appear when printing, and to appear after undergoing the specified transformation (e.g., in the attached example, the 3D rotation causes the text to horizontally be mirrored).

I was able to create a simple HTML page reduction that illustrates this error. No content appears on screen, but when printing, the content of the DIV is visible. Using the HTML file, I confirmed that the issue appears in the current nightly build (Version 9.1.2 (11601.7.7, r204466)).

The attached file provides an HTML file with sufficient CSS to demonstrate the issue.

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