The mergeStyles function is unable to target a child element by its id within a parent element identified by its class

Consider the code snippet below:

<div class="example">
  <div id="label">
    Label text
  </div>
</div>

The CSS provided can style 'Label text' successfully:

.example #label {
  color: red;
}

However, when using fluentUI mergeStyles, the styling does not apply as expected:

const RedLabelStyles = mergeStyles({
  ".example #label": {
    color: "red"
  }
});

The issue lies in the selector, not the CSS itself. The correct application of styles is demonstrated below:

const RedLabelStyles = mergeStyles({
  "#label": {
    color: "red"
  }
});

Answer №1

The reason for the issue was that the RedLabelStyles class was mistakenly applied to the parent

<div class="example">
instead of the intended child element. To resolve this, the JSX code should be structured as shown below:

<div class={RedLabelStyles}>
  <div class="example">
    <div id="label">
      Label text
    </div>
  </div>
</div>

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