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<!DOCTYPE html> <html> <head> <title>v-bind background-color</title> <style> #app > div { width: 200px; padding: 20px; border: dashed black 1px; } .myClass { background-color: lightcoral; } </style> </head> <body> <h1>Example: 'v-bind:' shorthand form ':'.</h1> <p>Take a look at the div where the class is set with the 'v-bind:' shorthand form ':'.</p> <div id="app"> <div :class="{ myClass: isImportant }"> Importance visualized by background color </div> </div> <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script> <script> const app = Vue.createApp({ data() { return { isImportant: true } } }) app.mount('#app') </script> </body> </html>