javascript - Is it normal to have two elements with same id in two div elements with other id?

Question

I know, that two elements can't hav the same id. But it's happens so, that in my project I have two elements with same id in other divs, like this

<div id="div1">
     <img id="loading" />
</div>
<div id="div2">
     <img id="loading" />
</div>

And CSS:

#div1 #loading
{
    some style here...
}
#div2 #loading
{
    another style here...
}

Works fine for me, but maybe it is not reccomended to do by so?

Yes, I know, thet I can use classes, and it's strongly recomended to do by so, but I want to know is there any potential risk in this usage of id? I think no, because when I wrote for example

$("#div1 #loading")... it becomes a unique element. Isn't it?

Answer 1

Change your id to class. It is not a good idea to give duplicate id.

Think two students having same roll no in a class. Imagine them getting examination result. How will the school be able to recognise the marksheet?

Your way is not cross browser compatible, and will affect a lot while coding JavaScript, and posted form etc

You can get the same effect using class

see

<div id="div1">
     <img class="loading" />
</div>
<div id="div2">
     <img class="loading" />
</div>

and css:

#div1 .loading
{
    some style here...
}
#div2 .loading
{
    another style here...
}