Why Doesn\'t My Label Element Fill the Entire Height When Setting `height: 100%;`?

Label Height Issue with Percentage Setting

Despite setting the height to 100%, the label element remains unaffected. This is because height: 100%; relies on a reference point, typically the parent element's height.

In the provided code snippet, .field label has a height: 100%; property, but the parent element, .field, does not specify a height value. Consequently, the browser lacks a defined height against which to calculate 100%.

To address this, establish a height value for the .field parent element. For example, you could assign a fixed height using height: 200px; or a percentage height based on a containing element using height: 50vh; (where vh represents viewport height).

Modified Code:

<code class="css">.field {
    display: block;
    margin-bottom: 9px;
    background: none;
    border: none;
    height: 200px; /* Fixed height for reference */
}

.field label {
    color: #3E3E3E;
    font-weight: bold;
    width: 80px;
    display: block;
    float: left;
    margin-top: 5px;
    margin-left: 3px;
    height: 100%; /* Now it has a reference, 200px */
}</code>

By providing a height context for the parent element, the label's 100% height setting will take effect, resulting in a fully expanded label within the .field container.

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