Not to mention that that fixed elements are just-plain broken in the Android browser. They don't attach to the edges of the viewport (which would be bad for the

Not to mention that that fixed elements are just-plain broken in the Android browser. They don't attach to the edges of the viewport (which would be bad for the reasons you outlined) — they simply sit in whatever position they are given when the page first renders (which is also bad because it often covers content you'd like to see, or interact with).