Selection on Browsers

When we try to select chunks of text and/or images on a web site very often we end up selecting unwanted and unpredictable bits. I'm sure a lot of people have experienced this effect, this happens because the organization of content in html isn't very intuitive to someone who doesn't understand html. Content is stuck inside blocks or tables and there are often tables inside tables. In our browsers, we can't select cells from different tables at the same time and this causes strange behaviours when we drag the cursor over a page. This only happens because the browser developers are lazy, it's easier to make the selections match the html organization but its counter intuitive, non-productive and not WYSIWYG at all, for the end-user.