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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8" />
- <meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <title>Document</title>
- <style>
- input {
- /* 轮廓outline */
- outline: none;
- outline: 3px solid #f00;
- outline-width: 1px;
- outline-style: dashed;
- outline-color: purple;
- /* border: none; */
- }
- div {
- /* 将元素转成行内元素 */
- /* display: inline; */
- }
- span {
- width: 300px;
- height: 300px;
- border: 3px solid #000;
- margin-left: 20px;
- /* 将元素转成块级元素 */
- /* display: block; */
- /* 将元素转成行内款元素 */
- display: inline-block;
- }
- h2 {
- /* 将元素隐藏 */
- display: none;
- /* color: rgba(0, 0, 0, 0); */
- /* opacity: 0; */
- /* 显示元素 */
- display: block;
- }
- </style>
- </head>
- <body>
- <input type="text" name="" id="" />
- <div>111</div>
- <span>2222</span>
- <span>333</span><span>444</span>
- <h2>显示/隐藏</h2>
- </body>
- </html>
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