Scoped Styles rarely stand a chance against more dominant styles

I'm facing a scope issue while learning Vue.

Question: I am trying to make sure that the styles in profile.vue do not override the ones in sidebar.vue. I want the sidebar to have a red background and the profile section to be blue. Shouldn't using scoped within the style tag take care of this?

Output: https://i.sstatic.net/3XFdz.png

Profile.vue below:

<template>
  <main>
    <section>
      Test
    </section>
    <Sidebar></Sidebar>
  </main>
</template>

<script>
  import Sidebar from "../../components/sidebar/Sidebar";
  export default {
    name: "Profile",
    components: {Sidebar}
  }
</script>

<style scoped lang="scss">
  main {
    width: 100%;
    @include flex();

    section {
      width: 100%;
      background: blue;
      margin-left: $size*5;
    }
  }
</style>

Sidebar.vue below:

<template>
  <section>
    Test
  </section>
</template>

<script>
  export default {
    name: "Sidebar"
  }
</script>

<style scoped lang="scss">
  section {
    max-width: ($size*45);
    width: 100%;
    background: red;
  }
</style>

Answer №1

Your child-component's root element being a section is causing the issue at hand

In this case, a parent component has the ability to style the root elements of its child components. Typically, this is done to easily apply styles like margin and padding to a child component. However, in your scenario, there is a conflict arising.

When looking at your code:

<template>
  <div>
    <section>...</section>
    <your-component></your-component>
  </div>
</template>

Your scoped css interprets it as:

<template>
  <div>
    <!-- I have styling control here -->
    <section>...</section>
    <section>
    <!-- I do not have styling control here -->
    </section>
  </div>
</template>

The scoped css recognizes that it should not enter the component itself and can only target the component's root level for styling. Since the root element is a section, the css selector remains valid.

To resolve this conflict, wrap your child component like this:

<template>
  <div>
    <section>...</section>
  </div>
</template>

You also have the option to style them using different classes or methods.

For more information, refer to the official documentation.

Answer №2

Check out these resources for more information on this topic:

If you need further clarification, you can find a solution here:

How to properly implement "scoped" styles in VueJS single file components?

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