webui: add rehype plugin to restore HTML in Markdown table cells #17477
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The remark/rehype pipeline neutralizes inline HTML as literal text (remarkLiteralHtml) so that XML/HTML snippets in LLM responses display as-is instead of being rendered. This causes <br> and <ul> markup in table cells to show as plain text. This plugin traverses the HAST post-conversion, parses whitelisted HTML patterns (<br>, <ul><li>) from text nodes, and replaces them with actual HAST element nodes. For lists, adjacent siblings must be combined first as the AST fragmentation breaks pattern matching. Strict validation rejects malformed markup, keeping it as raw text.
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allozaur
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…l-org#17477) * webui: add rehype plugin to restore HTML in Markdown table cells The remark/rehype pipeline neutralizes inline HTML as literal text (remarkLiteralHtml) so that XML/HTML snippets in LLM responses display as-is instead of being rendered. This causes <br> and <ul> markup in table cells to show as plain text. This plugin traverses the HAST post-conversion, parses whitelisted HTML patterns (<br>, <ul><li>) from text nodes, and replaces them with actual HAST element nodes. For lists, adjacent siblings must be combined first as the AST fragmentation breaks pattern matching. Strict validation rejects malformed markup, keeping it as raw text. * chore: update webui build output
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Description
When writing <br> or <ul><li>...</li></ul> inside Markdown table cells, they were displayed as raw text instead of being rendered as actual HTML elements.
This happens because the remark/rehype pipeline neutralizes inline HTML as literal text (via remarkLiteralHtml) so that XML/HTML snippets in LLM responses display as-is instead of being rendered. For lists, the pipeline can also fragment the markup across multiple AST nodes, so pattern detection fails.
The fix is a small rehype plugin that runs after Markdown conversion. It parses whitelisted HTML patterns (<br>, <ul><li>) from text nodes and replaces them with actual HAST element nodes. For lists, adjacent siblings are combined first to handle fragmentation.
Lists are validated strictly: if there's garbage text mixed in, it stays as raw text to avoid creating broken HTML.
Close #17462