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JavaScript: How to Load Content While Scrolling Down Page

The ability to load your web page images gradually as a visitor scrolls down your web page is great because it decreases initial load time; their browser only loads what fits in their browser window size. This functionality is also known as, “Lazy Loading”. See it in full effect on Mashable.com (The first place I’ve seen it used and is still used today).

But, as nifty as Lazy Loading may be, besides the fact that your website visitors have less KB to download when the page initially loads, I’m wondering if it has any affect on SEO rankings? and does it have any affect on conversion rates?