diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 51fb4f4..4a16d11 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,6 +29,9 @@ jobs:
       - name: Verify accessible SVG contract
         run: python3 scripts/test-lint-a11y.py
 
+      - name: Verify URL SVG normalization
+        run: python3 scripts/test-build-icons-quoted-attributes.py
+
       - name: Verify Devicon normalization
         run: python3 scripts/test-build-icons-devicon.py
 
diff --git a/scripts/build-icons.py b/scripts/build-icons.py
index e78045b..5cca93f 100644
--- a/scripts/build-icons.py
+++ b/scripts/build-icons.py
@@ -246,11 +246,13 @@ def normalize_url(raw: str) -> str:
     - White / near-white fills (#fff, #ffffff, white) are kept as-is — they
       act as contrast cutouts in 2-colour logos (e.g. white letter on coloured
       circle).  Every other colour becomes currentColor.
-    - inline style="fill:#..." is rewritten to a fill= attribute.
+    - inline fill/stroke colours are normalized without discarding other styles.
     - Inkscape layer translate() transforms are stripped (canvas offset artefact).
     """
-    vb_match = re.search(r'viewBox="([^"]+)"', raw, re.IGNORECASE)
-    viewbox = vb_match.group(1) if vb_match else "0 0 128 128"
+    vb_match = re.search(
+        r'\bviewBox\s*=\s*(["\'])(.*?)\1', raw, flags=re.IGNORECASE
+    )
+    viewbox = vb_match.group(2).strip() if vb_match else "0 0 128 128"
     inner = re.search(r"<svg\b[^>]*>(.*?)</svg>", raw, flags=re.DOTALL | re.IGNORECASE)
     if not inner:
         raise ValueError("no <svg> in payload")
@@ -261,27 +263,55 @@ def normalize_url(raw: str) -> str:
     # Strip Inkscape canvas-offset translate transforms from group wrappers
     body = re.sub(r'\btransform="translate\([^"]+\)"', '', body)
 
-    def _rewrite_fill(m: re.Match) -> str:
+    def _normalized_fill(value: str) -> str:
         """Keep white; turn everything else into currentColor."""
-        hex_val = m.group(1).lower().strip()
+        hex_val = value.lower().strip()
         if hex_val in ("#fff", "#ffffff", "white", "#fefefe", "#fdfdfd"):
-            return 'fill="#fff"'
-        return 'fill="currentColor"'
+            return "#fff"
+        return "currentColor"
 
-    # Rewrite inline style="fill:#rrggbb" → standalone fill= attribute
+    def _normalize_inline_style(match: re.Match) -> str:
+        quote, declarations = match.group(1), match.group(2)
+        declarations = re.sub(
+            r'(\bfill\s*:\s*)(#[0-9a-fA-F]{3,8}|white)\b',
+            lambda fill: f"{fill.group(1)}{_normalized_fill(fill.group(2))}",
+            declarations,
+            flags=re.IGNORECASE,
+        )
+        declarations = re.sub(
+            r'(\bstroke\s*:\s*)#[0-9a-fA-F]{3,8}\b',
+            lambda stroke: f"{stroke.group(1)}currentColor",
+            declarations,
+            flags=re.IGNORECASE,
+        )
+        return f"style={quote}{declarations}{quote}"
+
+    # Normalize supported inline colours while preserving unrelated declarations.
     body = re.sub(
-        r'style="[^"]*fill:\s*(#[0-9a-fA-F]{3,8}|white)[^"]*"',
-        lambda m: _rewrite_fill(re.search(r'(#[0-9a-fA-F]{3,8}|white)', m.group(0))),
+        r'style\s*=\s*(["\'])(.*?)\1',
+        _normalize_inline_style,
         body,
+        flags=re.IGNORECASE,
     )
-    # Rewrite standalone fill="#rrggbb" attributes
+    # Rewrite standalone fill="#rrggbb" attributes.
     body = re.sub(
-        r'\bfill="(#[0-9a-fA-F]{3,8}|white)"',
-        _rewrite_fill,
+        r'\bfill\s*=\s*(["\'])(#[0-9a-fA-F]{3,8}|white)\1',
+        lambda m: f'fill="{_normalized_fill(m.group(2))}"',
         body,
+        flags=re.IGNORECASE,
+    )
+    body = re.sub(
+        r'\bstroke\s*=\s*(["\'])#[0-9a-fA-F]{3,8}\1',
+        'stroke="currentColor"',
+        body,
+        flags=re.IGNORECASE,
+    )
+    body = re.sub(
+        r'\bfill\s*=\s*(["\'])none\1',
+        '',
+        body,
+        flags=re.IGNORECASE,
     )
-    body = re.sub(r'\bstroke="#[0-9a-fA-F]{3,8}"', 'stroke="currentColor"', body)
-    body = re.sub(r'\bfill="none"', '', body)
     body = re.sub(r"\s+", " ", body).strip()
     return (
         f'<svg aria-hidden="true" width="24" height="24" viewBox="{viewbox}" '
diff --git a/scripts/test-build-icons-quoted-attributes.py b/scripts/test-build-icons-quoted-attributes.py
new file mode 100755
index 0000000..df5001f
--- /dev/null
+++ b/scripts/test-build-icons-quoted-attributes.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+"""Regression tests for quote-independent URL SVG normalization."""
+
+from __future__ import annotations
+
+import importlib.util
+import re
+import sys
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parent.parent
+BUILD = ROOT / "scripts" / "build-icons.py"
+
+
+def load_build_module():
+    sys.dont_write_bytecode = True
+    spec = importlib.util.spec_from_file_location("diagram_design_build_icons", BUILD)
+    if spec is None or spec.loader is None:
+        raise AssertionError("could not load build-icons.py")
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+
+
+def main() -> int:
+    build_icons = load_build_module()
+    svg = (
+        "<svg viewBox='0 0 32 16'>"
+        "<path style='fill:#123456;stroke:#654321;opacity:.5' d='M0 0h32v16H0z'/>"
+        "<circle fill='#abcdef' stroke='#111111' cx='8' cy='8' r='4'/>"
+        "</svg>"
+    )
+    normalized = build_icons.normalize_url(svg)
+    if 'viewBox="0 0 32 16"' not in normalized:
+        raise AssertionError(f"single-quoted viewBox was not preserved: {normalized}")
+    if any(color in normalized for color in ("#123456", "#654321", "#abcdef", "#111111")):
+        raise AssertionError(f"source colors escaped normalization: {normalized}")
+    path = re.search(r"<path\b([^>]*)>", normalized)
+    if path is None:
+        raise AssertionError(f"normalized path is missing: {normalized}")
+    path_attributes = path.group(1)
+    for declaration in ("fill:currentColor", "stroke:currentColor", "opacity:.5"):
+        if declaration not in path_attributes:
+            raise AssertionError(
+                f"path lost or failed to normalize {declaration}: {normalized}"
+            )
+    if (
+        'fill="currentColor"' not in normalized
+        or 'stroke="currentColor"' not in normalized
+    ):
+        raise AssertionError(f"standalone quoted colours were not normalized: {normalized}")
+    print("PASS: URL SVG normalization handles single-quoted attributes")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/skills/diagram-design/assets/icons.html b/skills/diagram-design/assets/icons.html
index d6567e8..da96e06 100644
--- a/skills/diagram-design/assets/icons.html
+++ b/skills/diagram-design/assets/icons.html
@@ -212,7 +212,7 @@
 </div></section>
 <section class="cat"><h2>Statistical tools</h2><div class="grid">
 <div class="cell"><div class="icon"><svg aria-hidden="true" width="24" height="24" viewBox="0 0 128 128" fill="currentColor"><path fill="currentColor" d="M125 80.5c-1.7 0-3.1 1.3-3.1 3s1.3 3 3.1 3c1.7 0 3-1.3 3-3s-1.3-3-3-3zm-.1.5c1.4 0 2.4 1.1 2.4 2.5s-1 2.5-2.3 2.5c-1.4 0-2.4-1.1-2.4-2.5s.9-2.4 2.3-2.5zm-1 .8v3.4h.6v-1.5h.6l.9 1.5h.6l-.9-1.6c.6 0 .8-.4.8-.9 0-.6-.4-.9-1.2-.9h-1.4zm.5 1.5v-1.1h.7c.5 0 .7.2.7.6s-.3.6-.6.6l-.8-.1zM31.3 93.7c-1.6-1.2-3.5-2.2-6.1-3-3.3-1.1-8.1-2.2-10-2.9-1.2-.5-1.7-1.2-1.7-2.2 0-1.4 1.7-2.2 3.7-2.3 3.3.1 4.3 2 4.5 3.3h9.6v7.1zm12 8.9h7.1c6.2-.1 11.2-3.2 13.7-7.7.2-.4.4-.7.6-1.1.4.5.7.7 1.1 1.1 1.7 1.5 3.9 2.6 6.2 3.3 3.7 1.3 6.6 2.2 7.6 2.6 1.9.8 3.1 1.4 3.1 3.1 0 2-2.2 2.8-4.5 2.9-3.1-.1-6.2-1.6-6.1-4.7H60c.6 8.1 8.6 14.4 18 14.5 5.7-.1 11-1.7 14.4-5.8 3.4 3.5 7.4 5.7 13 5.8 8.9-.1 18.1-4.5 18.2-13.9 0-3-.8-5.6-2.7-7.8-1.7-2-4.1-3.3-7.4-4.2-3.3-1.1-8.1-2.2-10-2.9-1.2-.5-1.7-1.2-1.7-2.2 0-1.4 1.7-2.2 3.7-2.3 3.3.1 4.3 2 4.5 3.3h11.6c.1-8-6.6-13.3-16.1-13.3-7.1 0-11.9 2.7-14.3 6.6-2.6-4.1-7.8-6.6-14.3-6.6-6.8 0-11.5 2.6-14 6.3-2.8-3.6-7.4-5.9-13-5.9H31.3v6.1c-2.6-4.1-7.8-6.5-14.2-6.5-9.9 0-15.3 5.5-15.8 11.8 0 3.9 1.9 7.4 4.8 9.9 1.7 1.5 3.7 2.6 6 3.3 3.7 1.3 6.6 2.2 7.6 2.6 1.9.8 3.1 1.4 3.1 3.1 0 2-2.3 2.8-4.5 2.9-3.1-.1-6.2-1.6-6.1-4.7H-.1c.6 8.1 8.6 14.4 18 14.5 5.2-.1 10-1.5 13.2-4.5v3.8h12l.2-13.4zm0-18.9h6.5c2.4 0 4.5 2 4.5 4.5s-2 4.5-4.5 4.5h-6.5v-9zM92.5 95c-1.7-2-4.1-3.3-7.4-4.2-3.3-1.1-8.1-2.2-9.9-2.9-1.3-.5-1.9-1.2-1.9-2.2 0-1.4 1.7-2.2 3.7-2.3 3.4.1 4.3 2 4.5 3.3h8.2c.5 3.2 2.1 6.1 4.7 8.3 1.7 1.5 3.8 2.6 6.1 3.3 3.7 1.3 6.6 2.2 7.5 2.6 2 .8 3.1 1.4 3.1 3.1 0 2-2.3 2.8-4.5 2.9-3.1-.1-6.2-1.6-6.1-4.7H95c0-2.9-.9-5.3-2.5-7.2zM.1 11.2v3.5H25v-3.5H.1zm28.3 0v3.5H64s-3.6-3.5-8.4-3.5H28.4zm42.6 0v3.5h21.5l-1.3-3.5H71zm36.9 0l-1.3 3.5h21.3v-3.5h-20zM.1 18v3.5H25V18H.1zm28.3 0v3.5H68s-.5-2.7-1.3-3.5H28.4zM71 18v3.5h23.8L93.6 18H71zm34.3 0l-1.2 3.5h23.7V18h-22.5zm-98 6.8v3.5H18v-3.5H7.3zm28.3 0v3.5h10.8v-3.5H35.6zm21.4 0v3.5h10.8s.7-1.9.7-3.5H57zm21.2 0v3.5h19.1L96 24.8H78.2zm24.8 0l-1.3 3.5h19.2v-3.5H103zM7.3 31.7v3.5H18v-3.5H7.3zm28.3 0v3.5h27.6s2.3-1.8 3-3.5H35.6zm42.6 0v3.5H89v-1.9l.7 1.9h19.8l.7-1.9v1.9H121v-3.5h-20.3l-1.1 3-1.1-3H78.2zM7.3 38.5V42H18v-3.5H7.3zm28.3 0V42h30.6c-.7-1.7-3-3.5-3-3.5H35.6zm42.6 0V42H89v-3.5H78.2zm12.7 0l1.3 3.5H107l1.2-3.5H90.9zm19.3 0V42H121v-3.5h-10.8zM7.3 45.3v3.5H18v-3.5H7.3zm28.3 0v3.5h10.8v-3.5H35.6zm21.4 0v3.5h11.5c0-1.7-.7-3.5-.7-3.5H57zm21.2 0v3.5H89v-3.5H78.2zm15.2 0l1.3 3.5h9.9l1.3-3.5H93.4zm16.8 0v3.5H121v-3.5h-10.8zM.3 52.1v3.5h24.9v-3.5H.3zm28.1 0v3.5h38.4c.8-.8 1.3-3.5 1.3-3.5H28.4zm42.8 0v3.5H89v-3.5H71.2zm24.6 0l1.3 3.5h5.1l1.2-3.5h-7.6zm14.4 0v3.5h17.9v-3.5h-17.9zM.3 58.9v3.5h24.9v-3.5H.3zm28.1 0v3.5h27.1c4.8 0 8.4-3.5 8.4-3.5H28.4zm42.8 0v3.5H89v-3.5H71.2zm27.1 0l1.3 3.5h.2l1.3-3.5h-2.8zm11.9 0v3.5h17.9v-3.5h-17.9z"/></svg></div><div class="name">spss</div></div>
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diff --git a/skills/diagram-design/references/primitive-icons.md b/skills/diagram-design/references/primitive-icons.md
index 0721e45..88e762b 100644
--- a/skills/diagram-design/references/primitive-icons.md
+++ b/skills/diagram-design/references/primitive-icons.md
@@ -754,7 +754,7 @@ Source: Devicon / `spss-plain` (MIT)
 SAS analytics platform.
 
 ```svg
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