angular-directives

Create reusable Angular directives by encapsulating DOM interaction logic into attribute or structural directives, then declaring them in your module and applying the selector in templates to enable behaviors like overlays.

Host directives compose multiple behaviors on an Angular component by applying several directive selectors to a single host element, enabling consistent UI patterns like focus management and dynamic overlays without duplicating logic.

Attribute directives customize element behavior directly, while structural directives manipulate the DOM layout by adding or removing elements, which is necessary for implementing portals, overlays, and lazy rendering in Angular.

Yes, modern directive APIs require Angular v20 or later, utilizing updated interfaces to enforce safe composition patterns for attribute, structural, and host directives across your UI components.

Limitations of structural directives include strict composition requirements to ensure safe DOM manipulation, requiring adherence to documented patterns to prevent conflicts when dynamically rendering portals or overlays.

Element behavior customization fails if the directive is not properly declared in your module or if the selector syntax in the template is incorrect, preventing the encapsulated logic from binding to the host element.