规范 URL
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://tldfyi.com/iframe/glossary/canonical-url/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://tldfyi.com/glossary/canonical-url/Add a dynamic SVG badge to your README or docs.
[](https://tldfyi.com/glossary/canonical-url/)Use the native HTML custom element.
规范 URL 是当多个 URL 提供相似或相同内容时，网页的首选版本。rel='canonical' 标签告诉搜索引擎应索引哪个 URL，防止跨域名或 [[subdomain|子域名]] 的内容重复问题。
示例
If example.com and www.example.com serve the same page, a canonical tag on both pointing to example.com consolidates SEO signals.