How deeply does Pro Angular 16 cover shadow host?

Defines the host’s role and illustrates binding, event, directive, and component behavior without detailing rendering internals.

Shadow host

As explained in Pro Angular 16

A host element is the HTML element affected by an Angular binding through changes to its appearance, content, or behavior.

A host element is the HTML element a binding acts on. A binding can change its appearance, content, or behavior. Any HTML element in a template can host a binding, and one element can have multiple bindings that manage different aspects. section 11.2 section 11.2.4

Changing a host’s appearance

In `<div [ngClass]="classes()">Hello, World.</div>`, the div is the host. Angular evaluates `classes()` and passes its result to the `ngClass` directive, which changes the div’s CSS classes. section 11.2

For an event binding, the host plays the opposite role: it sends an event into the application. In a product table, `(mouseover)="selectedProduct.set(item.name)"` makes a `td` the event source. A separate binding can then highlight the selected row. section 13.2

Directives and components also use host elements. An attribute directive can read configuration from its host’s attributes and add CSS classes to that element. A component selector identifies its host; Angular then populates the matching element with the component’s template. section 14.3.1 section 16.2.1

How Pro Angular 16 covers it

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Also explained in

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Web Components in ActionA shadow host is the page-DOM node to which a shadow root is attached and whose shadow tree it parents.

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Related concepts

Web Componentspart of · Web Components are browser standards and APIs, including custom elements and shadow DOM, for creating reusable web interface elements with encapsulated structure, presentation, and behavior.
:host selectorused by · The CSS :host pseudo-class selects the host element associated with the current shadow-tree or component style scope.
event bindingused by · Event binding is an association between an event and the expression or handler that responds when the event occurs.
data bindingused by · Data binding is a technique that connects application data or state to user-interface elements or component properties so values or behavior can be represented or synchronized.
directiveused by · A directive is a framework-specific instruction attached to markup that controls processing, rendering, or the behavior of an element or template.
shadow roothas part · A shadow root is the root node of an encapsulated Shadow DOM subtree attached to a host element.

This explainer was generated by Manning's knowledge graph from the text of Pro Angular 16. The section links point to the parts of the book it draws on.