What is the best way to adjust the CSS of an element within the #shadow-root (open) in web development?

When dealing with a "#shadow-root (open)" element, it appears that manipulating the style using only CSS is not feasible. The shadow-root was generated by a third-party JavaScript script and displays an element as an overlay on the page that I am trying to eliminate.

My attempt to alter the style of the element using JavaScript was met with an error:

document.querySelector(".element").style.display = "none"

The error message reads:

Uncaught TypeError: Cannot read properties of null (reading 'style')

Is there a way to adjust the CSS instead?

javascripthtmlcssxmldom

Answer №1

Encountering the error message "Uncaught TypeError: Cannot read properties of null (reading 'style')" indicates that the element you are attempting to select using document.querySelector does not exist on the page.

Consider using the following code:

const shadowRoot = document.querySelector('#shadow-root-id').shadowRoot;
const element = shadowRoot.querySelector('.element');
element.style.display = 'none';

Be sure to replace #shadow-root-id with the ID of the #shadow-root element you wish to access and .element with the CSS selector for the specific element you intend to modify.

If the targeted element is deeply nested within the #shadow-root, you may need to utilize a more specific CSS selector to effectively target it.

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