...is not html5, but it's suitable for doing a web-browser-check nonetheless
Opera and IE9 fail at displaying the header, it shouldn't look like this
but like this
but then again, the russian doll effect in this section is made using Opera, so this header actually does look better using Opera or IE9
another Julia set animation, with rounded corners, at least in Firefox and IE9
it can be viewed in full screen if using Safari
right-clicking to "Save Video As..." works in all browsers except Safari
right-clicking to "Save Audio As..." works in all browsers except Safari
Apple has strengthen their "we don't care about your license, we prohibit downloading media"-policy. In Safari 5.1 it is no longer possible to right-click on either video or audio. When inspecting the code, there are div-elements placed on top of all video- and audio-elements. Those divs are not placed there by the creator of the code, but by Apple.
To avoid unnecessary installations of Safari, the Apple shadow-divs are shown in the recording below.
simplest possible drawing-code (mousemove only), using jQuery since pure javascript causes abdominal pain
drawing by pressing mouse, (mousedown, mousemove, mouseup)
radial gradient from one large black circle and one small red circle
this does not work as intended if using Opera and it is very slow if using IE9
moving midpoint of red circle by moving mouse ↓ (the black circle is centered in canvas)
moving both midpoints by moving mouse ↓
moving midpoint of black circle by moving mouse ↓ (the red circle is centered in canvas)
a slider is displayed if using Chrome, Safari, Opera
the slider changes the radius of the black circle making up the radial gradiant above
the explanatory text within figcaption tags
a color picker is displayed in Opera (the Macintosh "pick any color anywhere" works as well)
if not Opera, try #780000 in the input bar, then enter
↓
drag mouse to draw filled inverted rectangles
drag mouse to draw filled inverted squares
drag mouse to draw one square
(by double-clicking fast one might get two squares or more)
...for one page