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October 4, 2023 18:57
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Shady DOM example
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <title></title> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| </head> | |
| <body> | |
| <h2>Hello from outside the Shadow DOM!</h2> | |
| <!-- This Custom Element will be our Shadow Host and contain the Shadow Root. --> | |
| <my-element></my-element> | |
| <!-- This template will hold the implementation for our element. --> | |
| <template id="tmpl"> | |
| <style> | |
| h2 { | |
| color: blue; | |
| } | |
| </style> | |
| <h2>Hello from inside the Shadow DOM!</h2> | |
| </template> | |
| <!-- | |
| Just load the polyfills for Custom Elements, Shady DOM, and Shady CSS. | |
| The Shady CSS polyfill only supports Custom Elements. Since we need | |
| both the Custom Elements and Shady polyfills, may as well load the bundle! | |
| --> | |
| <script src="./node_modules/@webcomponents/webcomponentsjs/webcomponents-sd-ce.js"></script> | |
| <script> | |
| // prepareTemplate takes the template and applies the scoping attributes | |
| // to each element and puts styles in the <head>. | |
| ShadyCSS.prepareTemplate(tmpl, 'my-el'); | |
| class MyElement extends HTMLElement { | |
| connectedCallback() { | |
| // styleElement enables Custom Properties to work on this element | |
| // and any of its children. | |
| ShadyCSS.styleElement(this); | |
| this.attachShadow({mode: 'open'}); | |
| this.shadowRoot.appendChild(tmpl.content.cloneNode(true)); | |
| } | |
| } | |
| customElements.define('my-element', MyElement); | |
| </script> | |
| </body> | |
| </html> |
Back again xD
May be for you. What we can do without the file !!
./node_modules/@webcomponents/webcomponentsjs/webcomponents-sd-ce.js
Same with the exemple , 404
<script src="https://rawgit.com/webcomponents/webcomponentsjs/master/webcomponents-sd-ce.js"></script>Ciao
Replace line 29 & it will work.
<script src="./node_modules/@webcomponents/webcomponentsjs/webcomponents-sd-ce.js"></script>
<script src="https://unpkg.com/@webcomponents/[email protected]/bundles/webcomponents-sd-ce.js"></script>
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I continuously come back to this code when I need a simple custom element with shadow DOM for testing. Good that I made the demo :-D