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Container spec: clarify ordering of ALPH chunk.
Reported by user: https://code.google.com/p/webp/issues/detail?id=255 Change-Id: I9c027ea828d5a367b317744fad7607a16ed52fa5
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@ -271,9 +271,15 @@ An extended format file consists of:
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* An optional list of [unknown chunks](#unknown-chunks). _\[status: experimental\]_
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For a _still image_, the _image data_ consists of a single frame, whereas for
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an _animated image_, it consists of multiple frames. More details about frames
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can be found in the [Animation](#animation) section.
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For a _still image_, the _image data_ consists of a single frame, which is made
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up of:
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* An optional [alpha subchunk](#alpha).
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* A [bitstream subchunk](#bitstream-vp8vp8l).
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For an _animated image_, the _image data_ consists of multiple frames. More
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details about frames can be found in the [Animation](#animation) section.
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All chunks SHOULD be placed in the same order as listed above. If a chunk
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appears in the wrong place, the file is invalid, but readers MAY parse the
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