Apply css in dynamic injected html Code Answer

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I am doing something like StackOverflow editor. Fetch markdown text, transfer it to HTML, and inject it into the preview area. But when I tried to apply CSS to the injected HTML elements, it was ignored. In browser inspection, I can not find the stylesheet I write for the elements. I guess this is about the order of CSS rendering. Any suggestion will be appreciated.

    <div class="item">
      <label for="content">Contents</label>
      <textarea name="content" id="content" v-model="mdtext"></textarea>
    <div id="preview"></div>

import marked from 'marked'

export default {
  data () {
    return {
      mdtext: ''
  watch: {
    mdtext: function () {
      document.getElementById('preview').innerHTML = marked(this.mdtext)

<style scoped>
#preview p{
  width: 100%;
  word-break: break-all;
  word-wrap: break-word;

enter image description here


You’re using scoped css, which makes Vue add that data-v- attribute to the p as well. However, the generated <p> doesn’t not have that same data-v- attribute, which is why it’s not working.
You can easily fix it by using the deep selector:

<style scoped>
#preview >>> p {



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