How to hide HTML elements precisely by combining class names
This article explains how to use multi-class selectors without spaces in CSS (such as `.classA.classB.classC`) to accurately match elements with multiple specified class names at the same time, thereby achieving the goal of displaying only specific combinations and hiding other similar structures.
In actual development, especially when connecting to third-party HTML structures, we often need to rely solely on CSS to control the visibility of elements without modifying the DOM. The key is to understand exactly the syntax differences of CSS class selectors :
- .classA.classB.classC (no spaces): matches a single element that has three class names: classA, classB and classC ;
- .classA .classB .classC (with spaces): Matches .classC elements nested inside .classA and then nested inside .classB (that is, descendant relationships), which is irrelevant to this example.
Based on your HTML structure:
<div class="classA classB classC">A_display</div> <div class="classB classC">B_no_display</div> <div class="classC">C_no_display</div>
The goal is to show only the first ✅ Correct writing (recommended): ⚠️ Notes: Summary: CSS multi-class selectors implement "AND" logic through consecutive writing (without spaces) , which is the core technique for accurately controlling the display state of compound class name elements. A reasonable combination of intersection and cover-up rules can achieve a highly controllable style isolation effect without invading the DOM. /* Only match elements containing classA, classB, and classC at the same time */
.classA.classB.classC {
display: block; /* or inline / inline-block, set as needed */
}
/* Hide all elements containing classB and classC (but not classA) */
.classB.classC {
display: none;
}
/* Hide all elements that only contain classC (make sure C_no_display is also hidden) */
.classC {
display: none;
}
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