From 63c8f0ba6fae84ad6a287c993f6ef78e806b7329 Mon Sep 17 00:00:00 2001
From: seonghobae <8172694+seonghobae@users.noreply.github.com>
Date: Sat, 18 Jul 2026 02:18:12 +0000
Subject: [PATCH] =?UTF-8?q?=F0=9F=8E=A8=20Palette:=20Improve=20table=20acc?=
 =?UTF-8?q?essibility=20and=20alignment?=
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💡 What:
- Updated HTML table generation in `report.py` to use `<th scope="row">` for the first column.
- Applied `font-variant-numeric: tabular-nums` to table cells containing numbers.
- Targeted `thead th` and `tbody th` appropriately for styling.

🎯 Why:
- Using `<th scope="row">` provides critical context for screen reader users when navigating data tables.
- `tabular-nums` ensures numerical data aligns cleanly, making large tables significantly easier to scan visually.

♿ Accessibility:
- Better screen reader support via semantic row headers.
---
 .jules/palette.md            |  3 +++
 python/fast_mlsirm/report.py | 25 +++++++++++++++++++------
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/.jules/palette.md b/.jules/palette.md
index 74cddb7ad..935f31112 100644
--- a/.jules/palette.md
+++ b/.jules/palette.md
@@ -19,3 +19,6 @@
 ## 2024-07-13 - CLI Debugging Stack Traces
 **Learning:** Adding a `FAST_MLSIRM_DEBUG` bypass to user-friendly `try/except` blocks is crucial for DX. Otherwise, unexpected runtime errors during development will be swallowed into generic stderr messages, hiding the stack trace needed to actually fix the bug.
 **Action:** When adding `try-except` blocks to Python CLI subcommands to improve Developer Experience (DX) by preventing raw tracebacks for users, include a debug bypass (e.g., `if os.environ.get("FAST_MLSIRM_DEBUG"): raise`) in *all* catch blocks (including `RuntimeError` and `Exception`) to ensure tracebacks aren't swallowed during local development and debugging.
+## 2026-07-18 - Improve Table Accessibility and Alignment
+**Learning:** When generating HTML data tables, using `<th scope="row">` for the first identifying column improves screen reader accessibility. Additionally, applying `font-variant-numeric: tabular-nums;` to table cells ensures numbers align properly in columns.
+**Action:** Use `<th scope="row">` for row headers and `font-variant-numeric: tabular-nums` for numeric data cells in tabular data representations.
diff --git a/python/fast_mlsirm/report.py b/python/fast_mlsirm/report.py
index 30ee4276b..ab50e638d 100644
--- a/python/fast_mlsirm/report.py
+++ b/python/fast_mlsirm/report.py
@@ -317,10 +317,13 @@ def _table(rows: list[dict[str, Any]], *, label: str, limit: int = 12) -> str:
     columns = _columns(rows)
     body_rows = []
     for row in rows[:limit]:
-        cells = "".join(
-            f"<td>{escape(_format_value(row.get(column, '')))}</td>"
-            for column in columns
-        )
+        cells = ""
+        for i, column in enumerate(columns):
+            val = escape(_format_value(row.get(column, "")))
+            if i == 0:
+                cells += f'<th scope="row">{val}</th>'
+            else:
+                cells += f"<td>{val}</td>"
         body_rows.append(f"<tr>{cells}</tr>")
 
     note = ""
@@ -687,13 +690,23 @@ def _css() -> str:
   white-space: nowrap;
 }
 
-th {
+td,
+tbody th {
+  font-variant-numeric: tabular-nums;
+}
+
+thead th {
   background: #f1f4ef;
   color: #2f3437;
   font-size: 0.8rem;
 }
 
-tr:last-child td {
+tbody th {
+  font-weight: normal;
+}
+
+tr:last-child td,
+tr:last-child th {
   border-bottom: 0;
 }