There is the solution if you need only outline without border. It's not mine. I got if from Bootstrap css file. If you specify outline: 1px auto certain_color, you'll get thin outer line around div of certain color. In this case the specified width has no matter, even if you specify 10 px width, anyway it will be thin line. The key word in mentioned rule is "auto". If you need outline with rounded corners and certain width, you may add css rule on border with needed width and same color. It makes outline thicker.

尝试使用填充和背景色的边框，然后为轮廓边框:

.round_outline {
  padding: 8px;
  background-color: white;
  border-radius: 50%;
  border: 1px solid black;
}

对我来说很管用。

Chrome 94.0 +。

I tested it in chrome 94.0 and it seems that the outline property honors the border-radius now.

.outline { outline: 2px solid red; } .border { border: 2px solid red; } .outline-10 { border-radius: 10px; } .border-2 { border-radius: 2px; } .outline-2 { border-radius: 2px; } .border-10 { border-radius: 10px; } .outline-50 { border-radius: 50%; } .border-50 { border-radius: 50%; } .circle { display: inline-block; width:50px; height: 50px; } <strong>Test this in chrome 94.0+</strong> <br/><br/> border-radius: 2px <span class="outline outline-2">outline</span> <span class="border border-2">border</span> <br/><br/> border-radius: 10px <span class="outline outline-10">outline</span> <span class="border border-10">border</span> <br/><br/> border-radius: 50% <span class="outline outline-50">outline</span> <span class="border border-50">border</span> <span class="outline circle outline-50">outline</span> <span class="border circle border-50">border</span>

outline样式:auto已经拥有完全的浏览器支持很久了。

速记是:

outline: auto blue;

这让你设置自定义颜色，但不是自定义厚度，不幸的是(尽管我认为浏览器的默认厚度是一个很好的默认)。

您还可以在使用outline-style: auto时设置自定义outline-offset。

outline: auto blue;
outline-offset: 0px;

我把轮廓设置为透明。

input[type=text] {
  outline: rgba(0, 0, 0, 0);
  border-radius: 10px;
}

input[type=text]:focus {    
  border-color: #0079ff;
}

No. Borders sit on the outside of the element and on the inside of the box-model margin area. Outlines sit on the inside of the element and the box-model padding area ignores it. It isn't intended for aesthetics. It's just to show the designer the outlines of the elements. In the early stages of developing an html document for example, a developer might need to quickly discern if they have put all of the skeletal divs in the correct place. Later on they may need to check if various buttons and forms are the correct number of pixels apart from each other.

边界本质上是审美的。与大纲不同，它们实际上是盒子模型的一部分，这意味着它们不会重叠设置为margin: 0的文本;边界的每一边都可以单独设置样式。

如果你试图应用一个角半径轮廓，我假设你使用它的方式大多数人使用边界。如果你不介意我问，outline的什么属性使它在边界上是可取的?