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HTML

              
                <div id="app">
  <vue-read-progress color="#33CC00"></vue-read-progress>
  <p v-for="n in 5">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin quis sem quis quam imperdiet imperdiet ac id lectus. Aenean tristique quis ipsum vel pretium. Fusce efficitur sem massa, sit amet eleifend mauris lobortis pharetra. Suspendisse dignissim tortor at venenatis faucibus. Donec efficitur vitae metus vel rhoncus. Integer ac odio non urna tincidunt molestie non ut ligula. Etiam auctor porttitor tempor. Ut facilisis sapien nec consectetur blandit. In eu vehicula dolor. Duis ornare ultricies varius. Mauris malesuada consequat felis eget tincidunt. Morbi at tellus leo. Maecenas urna sem, scelerisque in tincidunt sit amet, porttitor quis lectus. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Maecenas massa sem, tincidunt non condimentum id, dictum sed nisi. Mauris tempor tortor at ligula lacinia, non mollis quam sodales. Integer fringilla in purus at sagittis. Cras convallis nisl vitae condimentum volutpat. Duis congue, tortor in tincidunt laoreet, felis eros pellentesque velit, nec porttitor eros magna sed orci. Morbi vitae aliquet arcu. Donec sollicitudin dui ligula, eu tincidunt eros auctor vitae. Interdum et malesuada fames ac ante ipsum primis in faucibus. Donec mattis ornare arcu, at interdum sapien sodales egestas. Vivamus vel feugiat leo, non consequat leo. Quisque mattis non nunc et rutrum. Sed ac nisi ac diam gravida rutrum. Integer finibus blandit dui, id volutpat urna vehicula id. Donec tempus nunc sed ante venenatis, in hendrerit odio euismod. Pellentesque tristique condimentum felis, vitae iaculis felis porta eget. Morbi varius elementum nunc, nec laoreet arcu viverra vitae. Fusce vehicula neque sed dui lobortis, eu tincidunt magna semper. Nam sodales sagittis ipsum, ut congue augue facilisis ac. Nunc porttitor, lectus egestas sagittis tempor, purus orci vestibulum erat, at molestie mi augue ac mauris. Etiam et ipsum elit. Nullam augue nulla, accumsan sit amet ullamcorper a, congue in nibh. Aenean a ex et arcu tristique posuere eu in justo. Integer suscipit tincidunt augue at rhoncus. Proin venenatis aliquet sagittis. Nulla a purus laoreet, porttitor eros quis, tincidunt dui. Maecenas nibh mi, interdum sit amet elit at, malesuada tincidunt nulla. Curabitur ut malesuada erat, nec malesuada leo. Integer porttitor dictum tortor, et laoreet purus egestas in. Duis et ullamcorper orci. Donec ultricies nisi id semper porta. Praesent fringilla velit nec nulla vestibulum facilisis. Nulla tincidunt ut tortor sed euismod. Nunc a enim metus. Vestibulum ultricies, augue sit amet egestas tincidunt, purus nibh laoreet sapien, vehicula maximus tellus leo in nulla. Ut auctor id neque non malesuada. Nulla volutpat ligula eu elementum rutrum. Vestibulum at venenatis sapien. Vivamus at ex tortor. Phasellus eleifend tellus eu ante iaculis, ut ultrices justo scelerisque. Suspendisse potenti. Sed consectetur malesuada euismod. Nam sit amet nibh id turpis iaculis elementum vel vitae enim. Suspendisse finibus ornare velit elementum egestas. Fusce felis augue, aliquam et turpis vel, posuere vulputate ligula.
  </p>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.10/vue.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue-read-progress@1.0.4/dist/vue-read-progress.umd.js"></script>
              
            
!

CSS

              
                
              
            
!

JS

              
                const VueReadProgress = window['VueReadProgress'];

new Vue({
  el: '#app',
  components: {
    'vue-read-progress': VueReadProgress
  }
});
              
            
!
999px

Console