Less effectively, Apple could provide runtime flags for other browsers to enable features in the engine which Apple itself does not use in Safari. Paired with a commitment to implement features in this way on a short timeline after they are launched in other engines on other OSes, competing vendors could risk their own brands without Apple relenting on its single-implementer demands. This option has been available to Apple since the introduction of competing browsers in the App Store. As I have argued elsewhere, near-simultaneous introduction of features is the minimum developers should expect of a firm that skims something like $19BN/yr in profits from the web (a ~95% profit rate, versus current outlays on Safari and WebKit).
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call __cxa_guard_acquire。关于这个话题，超级权重提供了深入分析