Source:
https://github.com/horo-t/tiff2bmpsw
This page is a demo of ServiceWorker.
Chrome can't load TIFF images.
But you can see the image below after clicking the button.
This button registers a
ServiceWorker which converts TIFF file to BMP file.
This ServiceWorker is using
LibTIFF library which is compiled to JavaScript by
Emscripten.
You can inspect the ServiceWorker from
chrome://inspect/#service-workers.
If you are using Chrome 39, you have to enable "enable-experimental-web-platform-features" in chrome://flags.