Have you ever thought about why someone would want a web page to refresh automatically? One scenario is that the content on the webpage is updated in real-time, and refreshing is needed to display the latest information. Another scenario: using automatic refreshes to increase PV (page view) counts. In other words, when normally viewing a single page, it generates 1 PV for the website. However, when viewing a webpage with automatic refresh HTML code, the page keeps refreshing automatically, and each refresh adds another PV.
It's a very simple trick.