From `GPUProcessProxy::updatePreferences`: > It's not ideal that these features are controlled by preferences-level feature flags (i.e. per-web view), but there is only > one GPU process and the runtime-enabled features backing these preferences are process-wide. We should refactor each of these features > so that they aren't process-global, and then reimplement this feature flag propagation to the GPU Process in a way that respects the > settings of the page that is hosting each media element. > For the time being, each of the below features are enabled in the GPU Process if it is enabled by at least one web page's preferences. > In practice, all web pages' preferences should agree on these feature flag values.
<rdar://problem/95640152>