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How to get nested DOM

How to get nested DOM.
I want to get the nested DOM by Jquery.
For example.
<div id="red">
<div id="member">A</div>
</div>
<div id="blue">
<div id="member">B</div>
</div>
<div id="yellow">
<div id="member">C</div>
</div>
Is it possible to get the each memver id like, yellow.member
I want to do like this.
$("#yellow.member").removeClass("myclass");

The way you wanted to access the child element of #yellow was real close to be correct.
$("#yellow .member").removeClass("myclass");
Notice the added space. The space means to look for another matching element in the descendant tree of the element matched by the previous selector.
Now it's your markup that is wrong. You just cannot use the same id more than once. The concept of id comes from long before the computer age... An "identification" is unique per definition!
Here is how your markup should look like... in a working example where the interval is just for fun:
$(document).ready(function(){
setInterval(function(){
$("#yellow .member").toggleClass("myclass");
},1000);
});
.myclass{
background-color:yellow;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="red">
<div class="member">A</div>
</div>
<div id="blue">
<div class="member">B</div>
</div>
<div id="yellow">
<div class="member">C</div>
</div>

You can use nested selectors with jQuery:
$('#yellow #member').removeClass('myclass');
Removes .myclass from the #member element inside #yellow.
Also, your HTML isn't valid. You can use an ID only once per document, so change all <div id="member"> ... </div> to <div class="member"> ... </div>. Then the selector passed to jQuery changes to
$('#yellow .member')

What you're after is the .find() method.
$("#yellow").find('#member').removeClass("myclass");
Or children()
$("#yellow").children('#member').removeClass("myclass");
or
$('#yellow>#member'),removeClass("myClass");
EDIT: Also don't have duplicate id's. Use class attribute instead.

get a href attribute and set this attribute to other div

I have 3 classes with such a structure (this is slider in my web app):
<div class="emotion--digital-publishing">
<div class="dig-pub">
<div class="bg--image">/div>
<div class="dig-pub--layer center center">
<div class="layer--wrapper">
<div class="layer--content">
<div class="dig-pub--button">
</div>
</div>
</div>
</div>
</div>
</div>
I want to get href attribute of a and set a href atribute with this url to dig-pub. It is very important to me that this is the link (which class I clicked), because 3 classes have different links.
I would like to use jQuery.

You bind a click event to your anchor tag. you'll need to assign a class to the anchor tag too if you have many on the page so replace 'className' with your class name. I'm not sure how you want to assign it to the div so I've done it as a data-attribute as this is the conventional way to go.
$('a.className').on('click', function (){
$(this).closest('.dig-pub').attr('data-href', $(this).attr('href'));
});

(Don't forget to close the div on line 3 in your snippet)
jQuery('.dig-pub').on('click', function() {
url = jQuery(this).parent().find('a').attr('href');
jQuery(location).attr(url);
});
https://codepen.io/Kidkie/pen/gdaJjZ

First, add an id to the link and the div (easier to fetch the elements)
<div id="dig-pub" class="dig-pub">
<a id="id" href="/wilson-camo"></a>
Then, get the href
var href = $('#id').attr('href');
Set the value to the div
$('#dig-pub').html(href);
However, you could have find this easily on JQuery documentation.

Append class name to an iframe id that is included under a div class

I have the following code
<div id="ad">
<div id="adsensebanner">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>
and I'm searching of a way to make it like this, using jQuery and CSS attributes matching:
<div id="ad">
<div id="adsensebanner" class="addedclass">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>
Any ideas for searching for div that has another parent div and appending a class to the child one?

Your comments on various answers suggest your HTML is invalid and has more than one id="adsensebanner" in it, but just one id="ad" in it.
Your best bet is to make the HTML valid. There can be only one element with id="adsensebanner" in it.
However, if for some reason you want to only target that one element when it's inside id="ad":
document.querySelector("#ad #adsensebanner").classList.add("addedclass");
or with jQuery:
$("#ad #adsensebanner").addClass("addedclass");
That says "Add 'addedclass' to #adsensebanner only if it's inside #ad." There can be valid use-cases (if the one element with id="adsensebanner" may or may not be within #ad and you don't want to add the class if not), but they're rare.
If you correct the HTML to only have one id="adsensebanner", and you always want to add the class, then:
document.getElementById("adsensebanner").classList.add("addedclass");
or with jQuery:
$("#adsensebanner").addClass("addedclass");
In a comment you've said:
The double division check will definately work, however, my second div's ID name varies, so I would like to have it selected via an attr, like div[id*='adsensebanner']. Is there any workaround for this?
Yes, you can use any of the attribute substring selectors. For instance, if the id will always start with adsensebanner (id="adsensebanner1", id="adsensebanner2", etc.), then the selector to use with querySelector or jQuery would be "#ad div[id^=adsensebanner]". (Or you can use the contains one you mentioned, *=, or $= if it always ends with something.)

Try below:
$('#adsensebanner', window.parent.document).addClass("addedclass");

Simple JS can do the trick. And I can't see this div is inside the iFrame.
var p = document.getElementById("ad");
p.querySelector("[id='adsensebanner']").classList.add("addedClass");
<div id="ad">
<div id="adsensebanner">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>

This is only by JavaScript:
document.getElementById("ad").getElementsByTagName("div")[0].classList.add("addedClass");
$( "#ad div:nth-last-child(1)" ).addClass("addedClass");
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="ad">
<div id="adsensebanner">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>
<div id="ad1">
<div id="adsensebanner">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>
This will add a class only to div which have parent div id="ad"

How to select leaf tags of an html document using jsoup

I am using jsoup to parse an html document. I need to extract all the child div elements. This is basically div tags without nested div tags. I used the following in java to extract div tags,
Elements bodyTag = document.select("div:not(div>div)");
Here is an example:
<div id="header">
<div class="container">
<div id="header-logo">
<a href="/" title="mekay.com">
<div id="logo">
</div> </a>
</div>
<div id="header-banner">
<div data-type="ad" data-publisher="lqm.j2ee.site" data-zone="ron">
</div>
</div>
</div>
</div>
I need to extract only the following:
<div id="logo">
</div>
<div data-type="ad" data-publisher="lqm.j2ee.site" data-zone="ron">
</div>
Instead, the above code snippet is returning all the div tags. So, could you please help me figure out what is wrong with this selector

This one is perfectly working
Elements innerMostDivs = doc.select("div:not(:has(div))");
Try it online
add your html file
add css query as div:not(:has(div))
check resulted elements

If you want only div leafs that do not have any children then use this
Elements emptyDivs = document.select("div:empty");
The selector you are using now means fetch me all the divs that are not direct children of another div. It is normal that it brings the very first parent div, because the div id="header" is not a direct child of a div. Most likely its parent is body.

I need the jquery to reach this nested div

I can't figure out how to reach a nested div from the outer most element. Here is the html:
<li id="slide1">
<div id="video-container">
<div id=video-holder><div id="thumbnail"></div></div>
<div id=video-title></div>
<div id=video-desc></div>
</div>
</li>
I need jquery that will reach the id thumbnail from the starting id of the slide1

Use find to get the descendant.
$("#slide1").find("#thumbnail")
Basically since it is id you can just do: as id is supposed to be unique no matter where it appears.
$("#thumbnail");
For your scenario you want to use startswith selector to select the dynamic id starts with video_fake and in the 5th
slide.
$('#slide5fake').find('[id^=video_fake]').attr('id', 'newId')

$("#slide1").find("#thumbnail")

try this
<li id="slide1">
<div id="video-container">
<div id=video-holder><div class="thumbnail"></div></div>
<div id=video-title></div>
<div id=video-desc></div>
<div id="video-container">
<div id=video-holder><div class="thumbnail"></div></div>
<div id=video-title></div>
<div id=video-desc></div>
</div>
</li>
<script type="text/javascript">
$('#slide1').find('.thumbnail').each(function(){ });//you can get here two thumbnail
</script>

$("#thumbnail")
will find the thumbnail directly, but I suspect the id for your thumbnail will be repeated down the page, so you really need to be searchind for a class.
$("#slide1.thumbnail")
will do that if you change this line
<div id=video-holder><div id="thumbnail"></div></div>
to this
<div id=video-holder><div class="thumbnail"></div></div>

In case there are more "thumbnails" on your page, it would be better to give it a class. Ids should be unique.
In your given case, it would be sufficient to get it by ID
document.getElementById("#thumbnail")
If you gave it a class
document.querySelector("#slide1 .thumbnail")
would get you the element.
In jQuery the equivalent would be:
$("#slide1").find(".thumbnail");

There are many ways you can do this...
Single selector:
$('#slide1 #thumbnail');
If you already have the slide element:
var slide = document.getElementById("slide1");
// and then:
$('#thumbnail', slide);
Doing a .find() on the #slide1 element
$("slide1").find("#thumbnail");
But since you're using an ID it doesn't make sense to do anything else but finding that single ID, since you shouldn't have more than one element on a page with the same ID
$("#thumbnail");
There are probably more ways.. and what the best method is depends a lot on what you're doing and what the context is...
Good luck