In the 2000s, if you wanted to make interactive or animated visualization for the web, Flash was the main option. When Flash lost support and fell off the internet, a solid decade of great visualization no longer worked.
The New York Times has resurrected their archives with a Flash emulator. So pieces that were relegated to static thumbnail images are back. See the box office streamgraph that once upset many, the multi-line chart showing jobless rates for people like you, and the interactive stacked area chart on how people spend their day.