大量的HTML支持和宿主API改进，包括对透明HTML窗口的支持。
Numerous HTML support and hosting API improvements, including support for transparent HTML Windows.
在这种情况下，宿主系统定义了一套plugin必须遵循的API及plugin注入方式。
In these cases, the host system has a defined API to which the plugin must conform, and a way of injecting that plugin in.
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