[Webkit-unassigned] [Bug 165304] New: overflow: paged-x doesn't paginate in iframe in iOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165304

            Bug ID: 165304
           Summary: overflow: paged-x doesn't paginate in iframe in iOS
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: iPhone / iPad
                OS: iOS 10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dauwhe at gmail.com

Created attachment 295943
  --> https://bugs.webkit.org/attachment.cgi?id=295943&action=review
paged overflow file doesn't work if embedded in iframe

When using overflow: -webkit-paged-x inside an iframe, mobile Safari lays out the containing block horizontally with a horizontal scroll bar, but does not actually divide the content into discreet pages.

Instead of:

| line1 | line4 | line7 | line10 |
| line2 | line5 | line8 | line11 |
| line3 | line6 | line9 | line12 |

You get one giant, wide page:

| line1line2line3line4line5 |
| line6line7line8line9line10|
| line11line12line13line14  |

paged overflow works outside of an iframe in mobile Safari, and works inside and outside of iframes on desktop Safari.

Two test files are attached:

overflow-paged.html is a small sample of overflow: -webkit-paged-x. It works fine on its own.

iframe.html embeds the previous file, and that content doesn't paginate when inside the iframe.

A larger-scale example can be found at https://dauwhe.github.io/acme-labs/main.html?manifest=MobyDick/manifest.json.

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