Does google credit links from iFrames or created by Javascript, if so, is one more powerful than the other?

[A Former User]

Consider this example, because I want to be clear about what I mean.  You have two websites.  Lets all them www.a.com and www.b.com.

On www.a.com/some/page, there is an iframe something like this:
<iframe src="www.b.com/some/special/path"></iframe>
Then content of this iframe is a bunch of pictures, text and numbers, as well as a group of links, linking each picture to www.b.com for example the links might be:
www.b.com/content/1
www.b.com/content/2
www.b.com/content/3

Questions:

1. When google crawls **www.a.com/some/page, **does it pass link juice to www.b.com/content/*?
2. Does google instead consider these to be internal links within b.com itself.  because links to www.b.com/content/ ** are actually from b.com itself, since the domain of the iframe is actually: www.b.com/some/special/path 3) Is there any amount of link juice passed from www.a.com/some/page to* www.b.com/some/special/path **because this is the src= element of an iframe that a.com is hosting?

Consider an alternative setup.  Where instead of using an iframe the contents of the above described iFrame is actually added the the page dynamically using javascript, and a call to an API endpoint at b.com.  Resulting in these links being added directly to the body of a.com without being wrapped in an iframe element.

Questions:
4) Do these links that were created after page load still get crawled and credited by google? (i have heard in the past that google was going to start crawling javascript, i just don't know if this is known for a fact yet).
5) Do links created on the client side hold the same weight as a link that was served directly via the backend html generation?

6. If both the links within the iframe and the links within the javascript embed method pass link juice.  Is one preferred over the other? is one known to be more effective than the other?

Thanks!

[DmitriiK]

Hi there.

In short, Yes, iframes will pass link juice, but to the page, which is a source of iframe, not to pages, which are linked inside the iframe. And no, javascript created links are not passing rank flow.

When using iframe, basically what you are doing is you are pointing to the container on another website, and whatever is inside that container, it's hosted on that another website. That's why rank flows only to src link.

As for JS created links - they are considered hidden, devalued or obfuscated. Refer to this page on MOZ - https://a-moz.groupbuyseo.org/learn/seo/internal-link

Hope this helps.