Exploring the application of styles within the shadow DOM

I'm experimenting with applying styles to the shadow DOM. Consider the following example:

const element = document.getElementById("bar");
const shadowRoot = element.attachShadow({ mode: "open" });
const greeting = document.createElement("p");

greeting.setAttribute("class", "message");
greeting.textContent = "Hello Universe!";
shadowRoot.appendChild(greeting);
#bar::shadow .message{
  color: green; /*attempting to style */
}
<div id="bar"></div>

In the code snippet above, a

<p class="message">Hello Universe!</p>
is created in the shadow root within the
<div id="bar"></div>

I'm struggling to apply styles to the message class as it's located inside the shadow DOM. I've attempted using ::shadow, ::ng-deep, ::content but have not been successful. Any suggestions?

Answer №1

After conducting research, I have discovered that a shadow element is completely isolated from the rest of the environment. However, it is important to note that inheritable styles such as color, font, and line-height can still be inherited in a shadow DOM. To avoid this, one can use all: initial or, preferably, all: revert once it has better browser support.

For more information on styling in the Shadow DOM using CSS Shadow Parts, you can refer to Styling in the Shadow DOM With CSS Shadow Parts

Experimenting with some code, I was able to create a setup where external CSS affects the shadow DOM. By setting a part instead of a class using setAttribute, the desired effect can be achieved. Additionally, it is possible to apply styles directly by setting an attribute in JavaScript.

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