This view was correct. On the web, it is usually implemented through scripts such as javelin. These technologies use the browser to mark the text content so that it can be preserved in subsequent processing. Therefore, copying the text on the webpage often involved copyright issues and might violate relevant laws. Of course, some websites provide the option of "copying text", but usually this is just for the convenience of the user and will not actually copy the text to the whiteboard. Therefore, if you want to copy the text on the web page, it is recommended to use the whiteboard or manually copy and paste.