The task needs, to make a more formal website, you need to add the corresponding small icon in front of the title bar, the effect is roughly as follows:
In fact, it is very simple to implement. Add the following to the <head></head> tag in the html file:
<link rel="icon" href="picture.ico" type="image/x-icon"/>
Note: The suffix of the picture must be in .ico format.
My experience is for reference only!