Collapsible blocks at Wikipedia (mobile) do not work

[Jeffrey Barish]

Wikipedia (mobile) has blocks of text that can be made to appear or disappear by clicking an up/down arrow to the left of a title for the block. That arrow no longer has any effect in WebKit-based browsers (e.g., Midori 0.4.3 or dwb 20130503hg). To observe the problem, go to any page at Wikipedia (mobile), e.g.,

http://en.m.wikipedia.org/wiki/WebKit

Click the up/down arrow to the left of one of the section titles. Nothing happens. The corresponding block should open or close.

The arrows work using Chrome or Firefox. They do not work using Midori 0.4.3 or dwb 20130503hg. The buttons work using Midori 0.4.3 on Ubuntu 12.04. They do not work on Ubuntu 14.10, 14.04, or 13.10.

lsb_release -rd:

Description: Ubuntu 14.04.1 LTS
Release: 14.04

libwebkitgtk-1.0-0:
  Installed: 2.4.4-1~ubuntu1
  Candidate: 2.4.4-1~ubuntu1
  Version table:
 *** 2.4.4-1~ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2.4.0-1ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

On 14.10, the corresponding outputs are

Description: Ubuntu 14.10
Release: 14.10

libwebkitgtk-1.0-0:
  Installed: 2.4.6-1ubuntu1
  Candidate: 2.4.6-1ubuntu1
  Version table:
 *** 2.4.6-1ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages
        100 /var/lib/dpkg/status

[Jeffrey Barish (jeff-barish)]

This problem has magically disappeared, so I suppose that it must have been a problem at Wikipedia (although I can't then explain why the problem did not occur with other browsers).