Does the canonical-URL pass pagerank back to the original page from the child page at full value, no value or something in between?

I’ve got a site that would certainly benefit from being able to use the canonical-URL method. However there may be people who link to the child page and I want the parent page to get the benefit.
In Google, what percentage of pagerank for the child page is transmitted to the parent?
Does Bing support the canonical as well? Similar question.
Has anyone proven their hypothesis on yes or no?

 

I am not sure that I understand your question. If you are talking about the canonical meta tag, you shouldn’t be using it unless there is a very, very good reason. Instead, you should handle your choice of delivering pages with or without the www in your server .htaccess file.

What do you mean by child page? Consider the following:

www.mysite.com/news.html
mysite.com/news.html

These are not two pages- you only have a single page, and neither is a parent or a child.

If Google (Bing, etc.) are listing pages on your site both with and without the www, then it considers your site as two separate sites, possibly with duplicate content, which are fighting each other for link juice.

Again, do not fix this by using the canonical meta tag. Fix it for all pages on your site with a few lines of code in the server .htaccess file. For example, if you prefer your pages to be listed WITH the www:

Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} ^yoursite.com [NC] RewriteRule ^(.*)$ http://www.yoursite.com/$1 [L,R=301]