For some HTML packages with heavy visuels, such as 3D objects being rendered in Real Time, there is a way to use hardware acceleration in chromium as it is not enabled by default.
You have to add these parameters to an advanced configuration:
bsp.chromium_browser.blacklist
bsp.chromium_browser.disable-g
bsp.chromium_browser.use_onscr
And apply this configuration to your player.