Created
September 3, 2024 17:54
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| <!doctype html> | |
| <title>CSS Shadow Root styling</title> | |
| <script type=module> | |
| class CustomElement extends HTMLElement { | |
| connectedCallback() { | |
| const shadow = this.attachShadow({mode: 'closed'}) | |
| shadow.innerHTML = ` | |
| <style> | |
| :host { | |
| --background: yellow; | |
| } | |
| :host div { | |
| background: var(--background); | |
| } | |
| </style> | |
| <div>Shadow Root Content</div> | |
| ` | |
| } | |
| } | |
| customElements.define('custom-element', CustomElement) | |
| </script> | |
| <!-- With Default styling --> | |
| <custom-element></custom-element> | |
| <!-- With style override from DOM --> | |
| <custom-element style="--background: lime;"></custom-element> | |
| <!-- With style override from CSS Stylesheet --> | |
| <custom-element id=css></custom-element> | |
| <style> | |
| #css { | |
| --background: hotpink; | |
| } | |
| </style> | |
| <!-- With style override from JavaScript --> | |
| <custom-element id=js></custom-element> | |
| <script type=module> | |
| document.querySelector('#js').style.setProperty('--background', 'orange') | |
| </script> |
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