What does the purple dashed line on a web page indicate?

The Purpose of the Purple Dashed Line Area

Have you noticed a faint purple dashed line around certain elements on web pages? This article delves into its significance.

Understanding the Purple Dashed Line

The purple dashed line, also known as the "available expansion area," indicates the potential space where an element can expand its width. This area is dynamically calculated based on the element's content and the surrounding layout.

Example:

Consider a simple button with a single character: "1." Around the button, you'll observe the purple dashed line. As you add more characters to the button, such as "123," you'll notice that the length of the purple dashed line area decreases.

Code Illustration:

The following code snippet demonstrates the creation of a button with the purple dashed line:

<code class="html"><div>
    <button>1</button>
</div></code>

<code class="css">*, html, body {
    box-sizing: border-box;
    margin: 0;
}

div {
    position: relative;
    background-color: lightgreen;
}

button {
  display: flex;
  width: 100px;
}</code>

By examining the dev tools in your browser, you can visualize the purple dashed line in action.

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