Monitor web pages for content changes and get alerts. Track URLs, detect updates, view diffs. Use when asked to watch a website, track changes on a page, monitor for new posts/content, set up page change alerts, or check if a site has been updated. Supports CSS selectors for targeted monitoring.

监控网页内容变化并接收通知，跟踪URL、检测更新、查看差异。适用于需要监视网站、跟踪页面变更、监控新帖子或内容、设置页面变更提醒或检查网站是否更新的场景。支持使用CSS选择器进行精准监控。