Oops! An error occurred: Unable to access the 'appendChild' property of null. Any ideas on how to modify the CSS property of an open ShadowRoot?

https://i.sstatic.net/lBZqx.png

ShadowRoot(open)

I am looking to adjust the z-index property within this ShadowRoot.

host = document.getElementById("shadow-root");
var style = document.createElement( 'style' )
     style.innerHTML = '.rssapp { z-index: -1; }'
 host.shadowRoot.appendChild( style )
// var sheet = new CSSStyleSheet
// sheet.replaceSync( `.rssapp { z-index: -1 }`)
// host.shadowRoot.adoptedStyleSheets = [ sheet ]

Despite trying the code above, with both the commented portions and uncommented ones, I keep encountering the error message:
Uncaught TypeError: Cannot read property 'shadowRoot' of null at script.js:35 (anonymous) or Uncaught TypeError: Cannot read property 'shadowRoot' of null at script.js:38 (anonymous) respectively

Edit: I also attempted using the id XQqyAJD0d17SWeNW.

javascripthtmlcsstypeerrorshadow-dom

Answer №1

Is it possible to apply a specific style to the element that has been selected? Perhaps using Jquery:

$('#shadow-root .rssapp').attr('style', 'z-index:-1');

Alternatively, you could try something like this:

$('.rssapp').attr('style', 'z-index:-1');

I would appreciate your feedback on whether or not this solution is effective.

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