fix(doc-intel): include HTML in the default DocumentIntelligenceConverter file types

[Tai An (Anai-Guo)]

What

Adds DocumentIntelligenceFileType.HTML to the default file_types of DocumentIntelligenceConverter.

Why

DocumentIntelligenceConverter.__init__ documents the parameter as:

file_types (List[DocumentIntelligenceFileType]): The file types to accept. Defaults to all supported file types.

but the default list has never contained HTML, even though every other part of the converter treats HTML as supported:

• DocumentIntelligenceFileType lists HTML = "html" under the # No OCR group, next to DOCX / PPTX / XLSX — all three of which are in the default.
• _get_mime_type_prefixes() maps it to text/html and application/xhtml+xml.
• _get_file_extensions() maps it to .html.
• _analysis_features() puts HTML in no_ocr_types, and its docstring names .html explicitly.

accepts() is gated purely on self._file_types, so with the default the converter rejects HTML:

>>> conv = DocumentIntelligenceConverter.__new__(DocumentIntelligenceConverter)
>>> conv._file_types = inspect.signature(
...     DocumentIntelligenceConverter.__init__).parameters["file_types"].default
>>> conv.accepts(io.BytesIO(b""), StreamInfo(mimetype=None, extension=".docx"))
True
>>> conv.accepts(io.BytesIO(b""), StreamInfo(mimetype=None, extension=".html"))
False
>>> conv.accepts(io.BytesIO(b""), StreamInfo(mimetype="text/html", extension=None))
False

This looks like an oversight in #1352 ("Add HTML support to DocumentIntelligenceConverter"): that PR added the mimetype/extension mappings and tests, but the tests construct the converter with file_types=[DocumentIntelligenceFileType.HTML] explicitly, so the default path was never exercised. MarkItDown.enable_builtins() never passes file_types, so a user who configures docintel_endpoint gets HTML support only if they build the converter by hand.

Tests

Extends tests/test_docintel_html.py with two cases that read the actual default off the signature:

• test_docintel_default_file_types_cover_every_supported_type — pins the documented "all supported file types" contract to the enum, so the default cannot drift again when a type is added.
• test_docintel_default_accepts_html — the default converter accepts .html, text/html and application/xhtml+xml.

Both fail on main and pass with the change; the two pre-existing tests in the file are untouched and still pass. Formatted with black==23.7.0 (the pinned .pre-commit-config.yaml revision).

🤖 Generated with Claude Code

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