How does the JS engine collaborate with WebCore to update the DOM tree?

I curious about rendering engine (webkit) work internally... And so i get this image above

So mt problem and question is

I confused about web api, that is produced by JS engine and then JS engine will be interpreter that and will be communicate into webcore for updating DOM tree?? Its correct??

I guess DOM tree and render object is located at rendering engine (webcore) and to do manipulate that DOM tree rendering engine provide a api and JS engine also provide api in their languange

Is that my guess is correct??

Thankss

Let's clarify the roles of the different components involved:

> Rendering Engine (WebCore): The rendering engine, which is part of the
> browser's layout engine (such as WebKit), is responsible for rendering
> web content. It consists of WebCore (the core layout and rendering
> component) and other supporting modules.
>
> JavaScript Engine: The JavaScript engine (e.g., V8) is a separate
> component that executes JavaScript code. It is responsible for
> interpreting or compiling JavaScript code and performing computations.
>
> DOM Tree: The DOM tree represents the structured representation of the
> HTML document. It is an object-based model that allows JavaScript code
> and other browser components to interact with the document's elements
> and properties.

Now, let's explain the flow of communication between these components:

> Parsing HTML: When the browser receives an HTML document, the
> rendering engine parses the HTML markup using WebCore. This parsing
> process creates the initial DOM tree based on the HTML structure.
>
> Executing JavaScript: When the rendering engine encounters JavaScript
> code during parsing or as a result of user interaction (e.g., an event
> handler), it hands over the JavaScript code to the JavaScript engine.
> The JavaScript engine then executes the code and performs any
> necessary computations.
>
> Accessing the DOM: JavaScript code executed by the JavaScript engine
> can interact with the DOM tree using the DOM API. The DOM API provides
> methods and properties to read, modify, and manipulate the elements
> and structure of the document.
>
> Updating the DOM Tree: JavaScript code can dynamically modify the DOM
> tree by creating, removing, or modifying elements, attributes, and
> content. These modifications can include adding event listeners,
> updating styles, or changing the text content of elements.
>
> Rendering and Layout: As the DOM tree is modified, WebCore is notified
> of the changes by the JavaScript engine. WebCore performs the
> necessary updates to the rendering tree, which represents the visual
> layout of the document. This process includes recalculating the layout
> and applying any style changes.
>
> Painting and Display: Once the rendering tree is updated, the browser
> performs the painting process, converting the rendering tree into
> pixels that can be displayed on the user's device.
>
> So, in summary, the JavaScript engine executes JavaScript code and
> communicates with the rendering engine (WebCore) to update the DOM
> tree and trigger layout and rendering processes. The DOM tree and the
> rendering tree are both located within the rendering engine, and the
> JavaScript engine and the rendering engine collaborate to update and
> render the web content.