Timeline shows the increasing complexity of web standards
This new HTML 5 infographic from Evolution of the Web reminds us about the power, but also the complexity of developing and delivering web services today.
It shows how the web standards delivered through different browsers (show on each timeline row) have changed from here:
The infographic itself shows the experiences it's possible to create today in HTML 5, but suggests the difficulty in making them compatible across different browsers. On a positive note, it shows that new standards are now generally implemented more quickly across browsers.
I've also posted this infographic since it gives and introduction to different web standards if you rollover the interactive version: