Why Does My Child Selector Fail to Style Table Cells?-CSS Tutorial-php.cn

Why Does My Child Selector Fail to Style Table Cells?

Child Selector vs. Descendant Selector in Table Structures

When selecting elements in HTML documents, developers often use child selectors (>) to target direct children and descendant selectors to target any nested element. However, there are scenarios where the child selector seems to fail unexpectedly.

Consider the following example:

table tr td {
  background-color: red;
}

table > tr > td {
  background-color: blue;
}

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The first rule successfully selects all elements within elements within

elements. However, the second rule, which uses the child selector (>), fails to style any , which in turn is a child of

elements.

Puzzled by this behavior, developers might assume that since

is a child of

, the child selector should apply.

The confusion arises from the implicit inclusion of a

element in HTML. By default, browsers insert a element to contain elements. As a result, the actual element structure becomes:

<table>
  <tbody>
    <tr>
      <td></td>
    </tr>
  </tbody>
</table>

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In this modified structure,

is no longer a direct child of

, but rather a child of , which itself is a child of

. Therefore, the > selector cannot target .

To correct this issue, developers must select the tbody element explicitly:

table > tbody > tr > td {
  background-color: blue;
}

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This ensures that the child selector targets the correct element in the modified structure. Additionally, if a tbody element is explicitly added to the HTML document, the same selector can be used.

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