css - What is the purpose of this purple dashed line area?

Question

Does anyone know what this purple area represent?

question from:https://stackoverflow.com/questions/67252231/what-is-the-purpose-of-this-purple-dashed-line-area

Answer 1

It shows the available space where text can be expanded.

You can see this dashed area after text which means it is area where text can be expanded

*, html, body {
    box-sizing: border-box;
    margin: 0;
}

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

button {
  display: flex;
  width: 100px;
}

<div>
    <button>1</button>
</div>