scoped.vue

<template>
  <div class="a" v-html="content"></div>
</template>

<script>
  export default { 
    data() {
      return {
        content: 'this is a <a class="b">Test</a>',
      }
    },
  }
</script>

<style scoped>
  .a >>> .b {
    color: red;
  }
</style>