How to tell if someone's site is pseudo-static or purely static

IE browser
After opening the website you want to judge, enter Javascript:alert (document.lastmodified) in the URL box. This method can determine the last update time of a Web page. If the time is the same as the current time, the description is pseudo-static, and the reverse is true static.
　Firefox Firefox browser
First use Firefox to open a Web page, and so on when the page is fully opened into the Firefox console, "Tools"-"Error Console"-Shortcut: Shift+ctrl+j, and then enter in the console: Alert (document.lastmodified), Review the last modified time and record.
Next close the console, re-refresh the Web page, and then use the same method in the console to enter the query code, and then see the last modification time of the file, a few times if the discovery of a different time can be judged that it is pseudo-static

How to tell if someone's site is pseudo-static or purely static