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Search engines look for specific elements that are known to bring emphasis in web pages, like h[1-6], b, strong, and em. They skip over containers like span and div to get to the actual content. References :
Search engines don’t index elements. When the page is spidered the tags would be removed (and possibility the content within the tag ie: <script>) and the straight text parsed and indexed. Otherwise scripts, styles, etc would be indexed and yeild unfavourable results.
They could however use them to navigate the page and well formed HTML will parse better and yield better results. Image tags could be indexed for image searches and links could be spidered. References :
