B4: Render Host Layer: RVH and RWH
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The technical documentation provides an extensive overview of two crucial browser-side components in Chromium's multi-process architecture: the RenderViewHost (RVH) and the RenderWidgetHost(RWH). The RenderViewHost primarily handles the creation, destruction, and high-level management of the page lifecycle within a specific renderer process, serving as the communication link for overall page state and notifications. Conversely, the RenderWidgetHost is dedicated to managing the low-level display surface, specializing in receiving and forwarding user input events (like mouse and keyboard actions) and coordinating the rendering output via the compositor. While the RVH owns and orchestrates the RWH for the main view, modern features like Site Isolation mean multiple RWHs can exist within a single tab to handle separate, cross-site frames. The sources also note that frame-specific duties are increasingly delegated to the RenderFrameHost, narrowing the RVH's focus to page-wide concerns and legacy functions.
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