CodePen Embed - min-content

<div class="img-wrap">
<img src="https://i.imgur.com/7PfhoY4.jpg" alt="">
  階層式樣式表（英語：Cascading Style Sheets，縮寫：CSS；又稱串樣式列表、級聯樣式表、串接樣式表、階層式樣式表）是一種用來為結構化文件（如HTML文件或XML應用）添加樣式（字型、間距和顏色等）的電腦語言，由W3C定義和維護。
</div>

.img-wrap{
  border: 1px solid #ccc;
  display: inline-block;
  width:min-content;
}
img{
  width: 200px;
}

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