Is there a advantage to using Angular's component style encapsulation for improved performance?

Recently, I came across the styling methods of Angular 2 which allows you to directly include your styles within the component. If you want to explore more on this topic, check out loading styles.

There are two options for style encapsulation in Angular 2 - using native shadow dom or an emulated one. Can you enlighten me on the performance advantages of each when it comes to applying specific styles to components?

Answer №1

Regrettably, there are some performance issues related to emulated styles encapsulation. Angular relies on attributes to enforce CSS rules, which can be inefficient, particularly in the current iteration of Edge browser.

If you're curious about the benchmarks highlighting these challenges, feel free to visit: https://example.com/article12345

Therefore, it might be best to steer clear of Angular's styles encapsulation feature for large-scale projects in 2017.

You can stay updated on the progress of this issue here.

Answer №2

When it comes to emulated styling, there may not be any noticeable performance benefits. The main advantage lies in the style encapsulation that automatically applies styles to specific components.

emulated styling

During Ahead of Time (AoT) compilation, the process of rewriting styles occurs at build time. This is essential as doing it at runtime can consume a significant amount of time for analysis and rewriting.

The rewritten styles are then inserted into the <head> element of the document.

native shadow DOM

In the case of native shadow DOM, there can be some performance benefits. For example, the browser may recognize when a component only requires a local re-render, preventing unnecessary full page re-renders. Although I cannot provide a specific example at this moment.

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