Why Aren't My Vue.js ::v-deep, >>>, and Deep Selectors Working?

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Troubleshooting Vue.js ::v-deep, >>> and Deep Selectors

Background

Vue.js provides ways to style elements within nested components using deep selectors like ::v-deep, >>>, and :deep. However, issues arise when these selectors are implemented.

Problem

Attempting to use ::v-deep or >>> to target child elements from within a Vue component results in no effect. The style rules are passed verbatim to the browser.

Solution

Vue 2.0 - 2.6

Sass: Use ::v-deep

::v-deep .child-class {
  background-color: #000;
}

Without Sass: Use >>>

>>> .child-class {
  background-color: #000;
}

Ensure the component's