Common sense that you should always pay attention to when making web pages. Collection_Experience exchange

Background image does not scroll
IE browser supports a Body attribute bgproperties, which can prevent the background from scrolling:

About onfocus, onblur
I saw such a post in BI today and just wanted to study it.
focus Focus
blur out of focus
onfocus is an event function that is triggered when the focus is on the object
onblur is an event function that is triggered when the focus leaves the object
Mainly used in Select, Input, or Textarea tags.