Bug 124415 – REGRESSION: Adding a class to the body which alters appearance crashes WebCore

• Status: NEW
• Component: WebCore Misc.

[Nicholas Helke]

Opening the specified page and adding the "nightmode" to the body element causes WebCore to crash in WebCore::InlineFlowBox::deleteLine with a BAD_EXEC_ERROR on iOS and Mac.

Steps to reproduce:

1) Open specified page
2) Add the class "nightmode" to the body by seemingly any means (through the inspector or using javascript)

WebCore crashes.

Additional details:

1) This does not happen with Safari 6.0.2 (8536.26.17).
2) Eliminating the below CSS seems to work around the crash but breaks the design of other pages.
    body.nightmode article p:first-of-type::first-letter {
      color: white;
    }

I am not sure WebCore Misc. is the right component. This is a guess based on the backtrace.