All 5 Angular Elements (Web Components) questions
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What are Angular Elements and what problem do they solve? How do you pass data into an Angular Element from outside, such as from plain HTML or JavaScript? What is the difference between using Angular Elements and building a full micro frontend architecture? How would you build and bundle an Angular Element so it can be embedded as a single standalone script on any website?
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What is a simple real world example of when Angular Elements would be useful?

Beginner

Answer

Imagine a company wants to offer the exact same interactive product configurator on their own Angular based website and also as an embeddable widget on partner websites built with completely different technology. Building it once as an Angular Element lets both use cases share identical, consistently maintained code.
// The same component works both inside the main Angular app
<app-product-configurator></app-product-configurator>

// And as a standalone embeddable element on a partner's plain HTML site
<product-configurator></product-configurator>
Real-world example A furniture retailer builds their interactive room configurator once as an Angular Element, using it directly on their own site and also letting several retail partners embed the exact same tool on their own separate websites.

Common follow-ups: How do you keep an embedded Angular Element visually consistent with the styles of the host page it is placed on?;What are the tradeoffs of shipping a single feature as multiple separate Angular Elements versus one larger bundle?

Standalone Components;Angular CLI & Project Structure
All 5 Angular Elements (Web Components) questions