It is said that SE more value text closer to the top of the page and not to have a lot of coding before it. If I change parts in web-page's code, in example, I have a text about 'trees' places very low on web-page but I cut/paste it in html code to be just below <body> tag, it will have no effect visually when looking at the web-page as the text box position is assigned by apsolute positioning. Will that makes any difference to Search Engines seeing the text about 'trees' in html code just below <body> tag even though visually it's still down at the bottom of the page?
Yea, search engines read pages (html only) from top down and place more importance at the top. This is why css is so good for seo. It doesn't matter how the content is displayed in browsers.