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ISO-2022-JP encoder: document an oddity #155

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10 changes: 10 additions & 0 deletions encoding.bs
Original file line number Diff line number Diff line change
Expand Up @@ -2650,6 +2650,16 @@ consumers of content generated with <a>GBK</a>'s <a for=/>encoder</a>.

<h4 id=iso-2022-jp-encoder dfn export>ISO-2022-JP encoder</h4>

<div class="note no-backref">
<p>The <a>ISO-2022-JP encoder</a> is the only <a for=/>encoder</a> for which the concatenation of
multiple outputs can result in an <a>error</a> when run through the corresponding
<a for=/>decoder</a>.

<p class=example id=example-iso-2022-jp-encoder-oddity>Encoding U+00A5 gives 0x1B 0x28 0x4A 0x5C
0x1B 0x28 0x42. Doing that twice, concatenating the results, and then decoding yields U+00A5 U+FFFD
U+00A5.
</div>

<p><a>ISO-2022-JP</a>'s <a for=/>encoder</a> has an associated
<dfn>ISO-2022-JP encoder state</dfn> which is <dfn lt="ISO-2022-JP encoder ASCII">ASCII</dfn>,
<dfn lt="ISO-2022-JP encoder Roman">Roman</dfn>, or
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