[sub-sample-buffer-stitching.html]
disabled:
if os == "linux": https://bugzilla.mozilla.org/show_bug.cgi?id=1533762
if os == "win": https://bugzilla.mozilla.org/show_bug.cgi?id=1533762
if os == "mac": https://bugzilla.mozilla.org/show_bug.cgi?id=1533762
if os == "android": https://bugzilla.mozilla.org/show_bug.cgi?id=1846741