Please give me some advice for newbies, _html/css_WEB-ITnose

I copied this code from other web pages. It’s a text introduction on a scrolling picture. Please tell me what the id of each layer means. I can’t find it in all css files and js files.

Reply to the discussion ( Solution)

Read these two articles and you will understand!
http://www.w3school.com.cn/tags/tag_div.asp
http://jiongks.name/blog/html-or-id-or-class/

Search "htmlcap" for this one?

id is just a name! The names 1, 2, 3, and 4 should be designed for the convenience of Js implementation!

Search "htmlcap" for this one?

id is just a name! The names 1, 2, 3, and 4 should be designed for the convenience of Js implementation!
After searching on Baidu, what appeared was the caption attribute of html,

If you search for "htmlcap", what about this?

id is just a name! The names 1, 2, 3, and 4 should be designed for the convenience of Js implementation!
But these names cannot be searched in the js file?

Read these two articles and you will understand!
http://www.w3school.com.cn/tags/tag_div.asp
http://jiongks.name/blog/html-or-id-or-class/

Me I think these names should be the styles of the layer, but I can’t find it in the style sheet or the js file.

You can search for "htmlcap". Where is this?

id is just a name! The names 1, 2, 3, and 4 should be designed for the convenience of Js implementation!


Then if you remove the ID, will it still have JS effect?

After I copied the code, there has been no js effect. The effect of the original webpage is that as the pictures are changed, the introduction content is also changed. Now there is nothing and no text is displayed. This style is written like this ,
.nivo-html-caption {
display: none;
}
If you change the attribute value to something else, the text will all be displayed on the web page, without special effects, and will remain motionless. ,

After removing id="htmlcaption" just now, the image is no longer displayed,