<input type="text">

<input type="text" class="some-component" />

<input type="text" class="one-off" />
input {
  display: block;
  margin: 1rem;
}

input:where(:not([class*="some-component"])) {
  border: 4px solid blue;
}

/*  some feature later in cascade */
.one-off {
  border: 1px solid red;
}

External CSS

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External JavaScript

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