download
HTML download Attribute （下载属性）
The HTML download attribute specifies that the target will be downloaded when clicking on the hyperlink. It is used only if the href attribute is set. （HTML下载属性指定在单击超链接时下载目标。仅在设置了href属性时使用。）
The value of the attribute is the name of the downloaded file. The browser automatically identifies the correct file extension and adds it to the file (e.g., .img, .txt, .pdf,). The browser will use the original filename if the value is omitted. （属性的值是下载文件的名称。浏览器会自动识别正确的文件扩展名并将其添加到文件中（例如.img、.txt、.pdf ）。如果省略该值，浏览器将使用原始文件名。）
You can use the download attribute on the following elements: <a> and <area>.
Syntax
Syntax （语法）
<tag download></tag>
Example of the HTML download attribute used on the <a> element:
<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<h1>Click on the logo to download it:</h1>
<p>
<a href="/uploads/media/default/0001/01/0710cad7a1017902166203def268a0df2a5fd545.png" download>
<img src="/uploads/media/default/0001/01/0710cad7a1017902166203def268a0df2a5fd545.png" alt="w3cdoc" width="190" height="45">
</a>
</p>
</body>
</html>
Example of the HTML download attribute used on the <area> element:
<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<p>Click on one of the HTML, CSS or PHP logo and download it:</p>
<img src="/uploads/media/news_gallery/0001/01/thumb_316_news_gallery_list.jpeg" width="250" height="150" alt="block" usemap="#blockmap">
<map name="blockmap">
<area shape="circle" coords="50,32,25" alt="html" href="/uploads/media/book_gallery/0001/01/d450f0358f947dffb3af91195c3002600d74101b.png" download>
<area shape="circle" coords="218,115,25" alt="css" href="/uploads/media/book_gallery/0001/01/25521e981b34da57c8f51baddc5b76351b855818.png" download>
<area shape="circle" coords="195,32,28" alt="php" href="/uploads/media/book_gallery/0001/01/4bbee6698c4884f25c46010d61b658dd62d2c04f.png" download>
</map>
</body>
</html>