Further reading:
Techniques for approximating the visual layout of a web
page and determining the portion of the page containing
the significant content Automatic Visual Segmentation Of Webpages Techniques for approximating the visual layout of a web
page and determining the portion of the page containing
the significant content VIPS: a Vision-based Page Segmentation Algorithm Classifying functions of web blocks based on linguistic features How a Search Engine Might Identify the Functions of
Blocks in Web Pages to Improve Search Results