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Web views in VirtualBox (and other virtual GPUs) fail on WebKitGTK >= 2.44 because the guest GL stack cannot back the hardware DMABUF renderer. Setting WEBKIT_DMABUF_RENDERER_FORCE_SHM=1 fixes it and keeps accelerated compositing, confirmed in VirtualBox on WebKitGTK 2.54. Detect a hypervisor guest from the cpuinfo hypervisor flag before GTK init and set the variable non-replacing, so a user-exported value still wins. Bare metal is unchanged. The skill references are updated to match.