Why Are Styles Not Applied to InnerHTML in Angular?

Styles Not Working for innerHTML in Angular

Problem Statement:

When passing HTML code as innerHTML to a view, styles defined within the code are not being applied. If the HTML code does not include any inline styles, it displays correctly. However, when inline styles, such as background-color, are added to the HTML code, they are ignored.

Root Cause:

This behavior is a result of Angular's default component encapsulation being set to "Emulated." Emulated encapsulation prevents CSS styles from influencing elements both inside and outside of the component.

Solution:

To allow styles defined within innerHTML to be applied, the component's encapsulation must be changed to "None." This can be achieved by adding the following additional code to the app:

import { Component, ViewEncapsulation } from '@angular/core';

@Component({
  selector: 'example',
  styles: ['.demo {background-color: blue}'],
  template: '<div></div>',
  encapsulation: ViewEncapsulation.None,
})
export class Example {
  private someHtmlCode = '';

  constructor() {
    this.someHtmlCode = '<div class="demo"><b>This is my HTML.</b></div>';
  }
}

With encapsulation set to "None," styles defined within innerHTML will be added to the DOM automatically, allowing them to be applied to the elements created by the HTML code.

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