I need assistance comprehending the terms "constructed stylesheet" and #shadow-root in CSS

I am currently trying to override some CSS for an Angular widget, but no matter what I try, the styles don't seem to change. It appears that the widget is being loaded into multiple nodes labeled #shadow-root. I have done some research on this issue, but I still can't pinpoint where these applied styles are originating from.

https://i.sstatic.net/8Evob.png

If possible, I would like to avoid making changes directly to the widget itself and instead override these styles using a separate stylesheet.

cssshadow-dom

Answer №1

Find more information about adopted style sheets here

Learn about how these adopted style sheets work.

[...$0.shadowRoot.adoptedStyleSheets]

The component constructs these style sheets, often done using lit.

  static get styles() {
    return css`:host { background: red; }`;
  }

When utilizing lit, it generates a stylesheet from the css output and then adopts it.

document.adoptedStyleSheets = [ stylesheet ];

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