diff --git a/assets/demo/showcase.html b/assets/demo/showcase.html
index 22e0619ea..b26f24565 100644
--- a/assets/demo/showcase.html
+++ b/assets/demo/showcase.html
@@ -14,27 +14,27 @@
   (highlight, sticky note, stamp, ...), so annotation geometry follows the layout.
 -->
 <style>
-@font-face { font-family: "PC Mono"; src: url("{{ASSETS}}/fonts/JetBrainsMono-Regular.ttf"); }
-@font-face { font-family: "PC Inter"; src: url("{{FONTS}}/Inter[opsz,wght].ttf"); font-weight: 100 900; }
-@font-face { font-family: "PC Inter"; src: url("{{FONTS}}/Inter-Italic[opsz,wght].ttf"); font-weight: 100 900; font-style: italic; }
-@font-face { font-family: "PC Garamond"; src: url("{{FONTS}}/EBGaramond[wght].ttf"); font-weight: 400 800; }
-@font-face { font-family: "PC Garamond"; src: url("{{FONTS}}/EBGaramond-Italic[wght].ttf"); font-weight: 400 800; font-style: italic; }
-@font-face { font-family: "PC Playfair"; src: url("{{FONTS}}/PlayfairDisplay[wght].ttf"); font-weight: 400 900; }
-@font-face { font-family: "PC Playfair"; src: url("{{FONTS}}/PlayfairDisplay-Italic[wght].ttf"); font-weight: 400 900; font-style: italic; }
-@font-face { font-family: "PC Vibes"; src: url("{{FONTS}}/GreatVibes-Regular.ttf"); }
-@font-face { font-family: "PC Math"; src: url("{{FONTS}}/STIXTwoMath-Regular.ttf"); }
-@font-face { font-family: "PC Amiri"; src: url("{{FONTS}}/Amiri-Regular.ttf"); }
-@font-face { font-family: "PC Hebrew"; src: url("{{FONTS}}/NotoSansHebrew[wdth,wght].ttf"); font-weight: 100 900; }
-@font-face { font-family: "PC Devanagari"; src: url("{{FONTS}}/NotoSansDevanagari[wdth,wght].ttf"); font-weight: 100 900; }
-@font-face { font-family: "PC Thai"; src: url("{{FONTS}}/NotoSansThai[wdth,wght].ttf"); font-weight: 100 900; }
-@font-face { font-family: "PC Armenian"; src: url("{{FONTS}}/NotoSansArmenian[wdth,wght].ttf"); font-weight: 100 900; }
-@font-face { font-family: "PC Georgian"; src: url("{{FONTS}}/NotoSansGeorgian[wdth,wght].ttf"); font-weight: 100 900; }
-@font-face { font-family: "PC Tamil"; src: url("{{FONTS}}/NotoSansTamil[wdth,wght].ttf"); font-weight: 100 900; }
-@font-face { font-family: "PC Charis"; src: url("{{FONTS}}/CharisSIL-Regular.ttf"); }
-@font-face { font-family: "PC XiaoWei"; src: url("{{FONTS}}/ZCOOLXiaoWei-Regular.ttf"); }
-@font-face { font-family: "PC Mincho"; src: url("{{FONTS}}/ShipporiMincho-Regular.ttf"); }
-@font-face { font-family: "PC Gowun"; src: url("{{FONTS}}/GowunBatang-Regular.ttf"); }
-@font-face { font-family: "PC Emoji"; src: url("{{FONTS}}/NotoColorEmoji-Regular.ttf"); }
+@font-face { font-display: block; font-family: "PC Mono"; src: url("{{ASSETS}}/fonts/JetBrainsMono-Regular.ttf"); }
+@font-face { font-display: block; font-family: "PC Inter"; src: url("{{FONTS}}/Inter[opsz,wght].ttf"); font-weight: 100 900; }
+@font-face { font-display: block; font-family: "PC Inter"; src: url("{{FONTS}}/Inter-Italic[opsz,wght].ttf"); font-weight: 100 900; font-style: italic; }
+@font-face { font-display: block; font-family: "PC Garamond"; src: url("{{FONTS}}/EBGaramond[wght].ttf"); font-weight: 400 800; }
+@font-face { font-display: block; font-family: "PC Garamond"; src: url("{{FONTS}}/EBGaramond-Italic[wght].ttf"); font-weight: 400 800; font-style: italic; }
+@font-face { font-display: block; font-family: "PC Playfair"; src: url("{{FONTS}}/PlayfairDisplay[wght].ttf"); font-weight: 400 900; }
+@font-face { font-display: block; font-family: "PC Playfair"; src: url("{{FONTS}}/PlayfairDisplay-Italic[wght].ttf"); font-weight: 400 900; font-style: italic; }
+@font-face { font-display: block; font-family: "PC Vibes"; src: url("{{FONTS}}/GreatVibes-Regular.ttf"); }
+@font-face { font-display: block; font-family: "PC Math"; src: url("{{FONTS}}/STIXTwoMath-Regular.ttf"); }
+@font-face { font-display: block; font-family: "PC Amiri"; src: url("{{FONTS}}/Amiri-Regular.ttf"); }
+@font-face { font-display: block; font-family: "PC Hebrew"; src: url("{{FONTS}}/NotoSansHebrew[wdth,wght].ttf"); font-weight: 100 900; }
+@font-face { font-display: block; font-family: "PC Devanagari"; src: url("{{FONTS}}/NotoSansDevanagari[wdth,wght].ttf"); font-weight: 100 900; }
+@font-face { font-display: block; font-family: "PC Thai"; src: url("{{FONTS}}/NotoSansThai[wdth,wght].ttf"); font-weight: 100 900; }
+@font-face { font-display: block; font-family: "PC Armenian"; src: url("{{FONTS}}/NotoSansArmenian[wdth,wght].ttf"); font-weight: 100 900; }
+@font-face { font-display: block; font-family: "PC Georgian"; src: url("{{FONTS}}/NotoSansGeorgian[wdth,wght].ttf"); font-weight: 100 900; }
+@font-face { font-display: block; font-family: "PC Tamil"; src: url("{{FONTS}}/NotoSansTamil[wdth,wght].ttf"); font-weight: 100 900; }
+@font-face { font-display: block; font-family: "PC Charis"; src: url("{{FONTS}}/CharisSIL-Regular.ttf"); }
+@font-face { font-display: block; font-family: "PC XiaoWei"; src: url("{{FONTS}}/ZCOOLXiaoWei-Regular.ttf"); }
+@font-face { font-display: block; font-family: "PC Mincho"; src: url("{{FONTS}}/ShipporiMincho-Regular.ttf"); }
+@font-face { font-display: block; font-family: "PC Gowun"; src: url("{{FONTS}}/GowunBatang-Regular.ttf"); }
+@font-face { font-display: block; font-family: "PC Emoji"; src: url("{{FONTS}}/NotoColorEmoji-Regular.ttf"); }
 
 @page { size: Letter; margin: 0; }
 
@@ -598,11 +598,11 @@ a.box { position: absolute; display: block; color: transparent; font-size: 1pt;
   <p class="dek">Nine small plates, each exercising one piece of the PDF imaging model.</p>
   <div class="gfx">
     <figure>
-      <svg viewBox="0 0 160 120"><defs><linearGradient id="lg1" x1="0" y1="0" x2="1" y2="1"><stop offset="0" stop-color="#2a6fdb"/><stop offset="0.5" stop-color="#1a9e8f"/><stop offset="1" stop-color="#e9a100"/></linearGradient></defs><rect width="160" height="120" rx="6" fill="url(#lg1)"/></svg>
+      <svg role="img" aria-label="Axial shading: three-stop linear gradient" viewBox="0 0 160 120"><defs><linearGradient id="lg1" x1="0" y1="0" x2="1" y2="1"><stop offset="0" stop-color="#2a6fdb"/><stop offset="0.5" stop-color="#1a9e8f"/><stop offset="1" stop-color="#e9a100"/></linearGradient></defs><rect width="160" height="120" rx="6" fill="url(#lg1)"/></svg>
       <figcaption class="caption"><b>Axial shading</b> &middot; three-stop linear gradient</figcaption>
     </figure>
     <figure>
-      <svg viewBox="0 0 160 120"><defs><radialGradient id="rg1" cx="0.35" cy="0.35" r="0.75"><stop offset="0" stop-color="#fff5d6"/><stop offset="0.35" stop-color="#e9a100"/><stop offset="0.75" stop-color="#e4572e"/><stop offset="1" stop-color="#16213b"/></radialGradient></defs><rect width="160" height="120" rx="6" fill="#16213b"/><circle cx="80" cy="60" r="52" fill="url(#rg1)"/></svg>
+      <svg role="img" aria-label="Radial shading: off-centre focal point" viewBox="0 0 160 120"><defs><radialGradient id="rg1" cx="0.35" cy="0.35" r="0.75"><stop offset="0" stop-color="#fff5d6"/><stop offset="0.35" stop-color="#e9a100"/><stop offset="0.75" stop-color="#e4572e"/><stop offset="1" stop-color="#16213b"/></radialGradient></defs><rect width="160" height="120" rx="6" fill="#16213b"/><circle cx="80" cy="60" r="52" fill="url(#rg1)"/></svg>
       <figcaption class="caption"><b>Radial shading</b> &middot; off-centre focal point</figcaption>
     </figure>
     <figure>
@@ -614,31 +614,31 @@ a.box { position: absolute; display: block; color: transparent; font-size: 1pt;
       <figcaption class="caption"><b>Screen</b> &middot; additive light, /BM /Screen</figcaption>
     </figure>
     <figure>
-      <svg viewBox="0 0 160 120"><defs><clipPath id="cp1"><text x="80" y="88" text-anchor="middle" font-family="PC Playfair, serif" font-size="70" font-weight="bold">Clip</text></clipPath><linearGradient id="lg2" x1="0" x2="0" y1="0" y2="1"><stop offset="0" stop-color="#e4572e"/><stop offset="1" stop-color="#b83b5e"/></linearGradient></defs><rect width="160" height="120" rx="6" fill="#f1ece2"/><g clip-path="url(#cp1)"><rect width="160" height="120" fill="url(#lg2)"/><g stroke="#f2c14e" stroke-width="3">
+      <svg role="img" aria-label="Clipping path: glyph outlines as a clip" viewBox="0 0 160 120"><defs><clipPath id="cp1"><text x="80" y="88" text-anchor="middle" font-family="PC Playfair, serif" font-size="70" font-weight="bold">Clip</text></clipPath><linearGradient id="lg2" x1="0" x2="0" y1="0" y2="1"><stop offset="0" stop-color="#e4572e"/><stop offset="1" stop-color="#b83b5e"/></linearGradient></defs><rect width="160" height="120" rx="6" fill="#f1ece2"/><g clip-path="url(#cp1)"><rect width="160" height="120" fill="url(#lg2)"/><g stroke="#f2c14e" stroke-width="3">
         <line x1="0" y1="10" x2="160" y2="130"/><line x1="0" y1="40" x2="160" y2="160"/><line x1="0" y1="-20" x2="160" y2="100"/><line x1="0" y1="-50" x2="160" y2="70"/></g></g></svg>
       <figcaption class="caption"><b>Clipping path</b> &middot; glyph outlines as a clip</figcaption>
     </figure>
     <figure>
-      <svg viewBox="0 0 160 120"><defs><linearGradient id="fade" x1="0" x2="1"><stop offset="0" stop-color="#fff"/><stop offset="1" stop-color="#fff" stop-opacity="0"/></linearGradient><mask id="m1"><rect width="160" height="120" fill="url(#fade)"/></mask></defs><rect width="160" height="120" rx="6" fill="#f1ece2"/><g mask="url(#m1)"><rect x="12" y="14" width="136" height="92" rx="8" fill="#2a6fdb"/><circle cx="60" cy="60" r="26" fill="#f2c14e"/><circle cx="104" cy="60" r="26" fill="#e4572e"/></g></svg>
+      <svg role="img" aria-label="Soft mask: luminosity gradient fades artwork" viewBox="0 0 160 120"><defs><linearGradient id="fade" x1="0" x2="1"><stop offset="0" stop-color="#fff"/><stop offset="1" stop-color="#fff" stop-opacity="0"/></linearGradient><mask id="m1"><rect width="160" height="120" fill="url(#fade)"/></mask></defs><rect width="160" height="120" rx="6" fill="#f1ece2"/><g mask="url(#m1)"><rect x="12" y="14" width="136" height="92" rx="8" fill="#2a6fdb"/><circle cx="60" cy="60" r="26" fill="#f2c14e"/><circle cx="104" cy="60" r="26" fill="#e4572e"/></g></svg>
       <figcaption class="caption"><b>Soft mask</b> &middot; luminosity gradient fades artwork</figcaption>
     </figure>
     <figure>
-      <svg viewBox="0 0 160 120"><rect width="160" height="120" rx="6" fill="#fffdf8" stroke="#e2dccf"/><g fill="none" stroke="#16213b" stroke-width="2.5"><path d="M16 26 H144" stroke-dasharray="12 6"/><path d="M16 46 H144" stroke-dasharray="2 6" stroke-linecap="round"/><path d="M16 66 H144" stroke-dasharray="18 5 3 5" stroke="#e4572e"/><path d="M16 96 Q 50 70 80 96 T 144 96" stroke="#1a9e8f" stroke-width="5" stroke-linejoin="round" stroke-dasharray="1 9" stroke-linecap="round"/></g></svg>
+      <svg role="img" aria-label="Dash patterns: caps, joins and phase" viewBox="0 0 160 120"><rect width="160" height="120" rx="6" fill="#fffdf8" stroke="#e2dccf"/><g fill="none" stroke="#16213b" stroke-width="2.5"><path d="M16 26 H144" stroke-dasharray="12 6"/><path d="M16 46 H144" stroke-dasharray="2 6" stroke-linecap="round"/><path d="M16 66 H144" stroke-dasharray="18 5 3 5" stroke="#e4572e"/><path d="M16 96 Q 50 70 80 96 T 144 96" stroke="#1a9e8f" stroke-width="5" stroke-linejoin="round" stroke-dasharray="1 9" stroke-linecap="round"/></g></svg>
       <figcaption class="caption"><b>Dash patterns</b> &middot; caps, joins and phase</figcaption>
     </figure>
     <figure>
-      <svg viewBox="0 0 160 120"><defs><pattern id="checks" width="16" height="16" patternUnits="userSpaceOnUse"><rect width="16" height="16" fill="#f1ece2"/><rect width="8" height="8" fill="#16213b"/><rect x="8" y="8" width="8" height="8" fill="#16213b"/></pattern><pattern id="hatch" width="8" height="8" patternUnits="userSpaceOnUse" patternTransform="rotate(45)"><rect width="8" height="8" fill="#fbeccc"/><line x1="0" y1="0" x2="0" y2="8" stroke="#e9a100" stroke-width="3"/></pattern></defs><rect width="160" height="120" rx="6" fill="url(#checks)"/><circle cx="80" cy="60" r="40" fill="url(#hatch)" stroke="#16213b" stroke-width="2"/></svg>
+      <svg role="img" aria-label="Tiling patterns: checks and rotated hatch" viewBox="0 0 160 120"><defs><pattern id="checks" width="16" height="16" patternUnits="userSpaceOnUse"><rect width="16" height="16" fill="#f1ece2"/><rect width="8" height="8" fill="#16213b"/><rect x="8" y="8" width="8" height="8" fill="#16213b"/></pattern><pattern id="hatch" width="8" height="8" patternUnits="userSpaceOnUse" patternTransform="rotate(45)"><rect width="8" height="8" fill="#fbeccc"/><line x1="0" y1="0" x2="0" y2="8" stroke="#e9a100" stroke-width="3"/></pattern></defs><rect width="160" height="120" rx="6" fill="url(#checks)"/><circle cx="80" cy="60" r="40" fill="url(#hatch)" stroke="#16213b" stroke-width="2"/></svg>
       <figcaption class="caption"><b>Tiling patterns</b> &middot; checks and rotated hatch</figcaption>
     </figure>
     <figure>
-      <svg viewBox="0 0 160 120"><rect width="160" height="120" rx="6" fill="#16213b"/><g transform="translate(80 60)"><g fill="none" stroke-width="1.2">
+      <svg role="img" aria-label="Fill rules: even-odd pentagram at 45% opacity" viewBox="0 0 160 120"><rect width="160" height="120" rx="6" fill="#16213b"/><g transform="translate(80 60)"><g fill="none" stroke-width="1.2">
         <path id="star" d="M0 -46 L13 -14 L46 -14 L19 6 L29 40 L0 20 L-29 40 L-19 6 L-46 -14 L-13 -14 Z" stroke="#f2c14e" fill="#f2c14e" fill-opacity="0.25" fill-rule="evenodd"/>
         <path d="M0 -46 L27 37 L-44 -14 L44 -14 L-27 37 Z" stroke="#e4572e" fill="#e4572e" fill-opacity="0.45" fill-rule="evenodd"/></g></g></svg>
       <figcaption class="caption"><b>Fill rules</b> &middot; even-odd pentagram, 45% opacity</figcaption>
     </figure>
   </div>
   <div class="rule"></div>
-  <svg viewBox="0 0 520 110" style="width:100%;height:auto;display:block">
+  <svg role="img" aria-label="Blend spectrum: multiplied gradient bands" viewBox="0 0 520 110" style="width:100%;height:auto;display:block">
     <defs><linearGradient id="spec" x1="0" x2="1"><stop offset="0" stop-color="#16213b"/><stop offset="0.25" stop-color="#2a6fdb"/><stop offset="0.5" stop-color="#1a9e8f"/><stop offset="0.75" stop-color="#e9a100"/><stop offset="1" stop-color="#e4572e"/></linearGradient></defs>
     <g style="mix-blend-mode:multiply">
       <path d="M0 80 C 80 10, 160 110, 260 50 S 440 20, 520 70 L520 110 L0 110Z" fill="url(#spec)" opacity="0.85"/>
@@ -789,16 +789,16 @@ a.box { position: absolute; display: block; color: transparent; font-size: 1pt;
     </div>
     <div class="canvas">
       <span class="lab" style="left:10pt;top:8pt">Review canvas</span>
-      <a class="box" style="left:12pt;top:26pt;width:152pt;height:40pt" href="https://mark.pdfcraft.invalid/freetext/1">.</a>
-      <a class="box" style="left:196pt;top:22pt;width:20pt;height:20pt" href="https://mark.pdfcraft.invalid/note/1">.</a>
-      <a class="box" style="left:196pt;top:60pt;width:18pt;height:22pt" href="https://mark.pdfcraft.invalid/attach/1">.</a>
-      <a class="box" style="left:16pt;top:88pt;width:90pt;height:60pt" href="https://mark.pdfcraft.invalid/square/1">.</a>
-      <a class="box" style="left:120pt;top:92pt;width:90pt;height:60pt" href="https://mark.pdfcraft.invalid/circle/1">.</a>
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-      <a class="box" style="left:16pt;top:268pt;width:196pt;height:40pt" href="https://mark.pdfcraft.invalid/line/1">.</a>
-      <a class="box" style="left:16pt;top:322pt;width:196pt;height:50pt" href="https://mark.pdfcraft.invalid/ink/1">.</a>
-      <a class="box" style="left:30pt;top:388pt;width:170pt;height:56pt" href="https://mark.pdfcraft.invalid/stamp/1">.</a>
+      <a class="box" style="left:12pt;top:26pt;width:152pt;height:40pt" href="https://mark.pdfcraft.invalid/freetext/1">freetext</a>
+      <a class="box" style="left:196pt;top:22pt;width:20pt;height:20pt" href="https://mark.pdfcraft.invalid/note/1">note</a>
+      <a class="box" style="left:196pt;top:60pt;width:18pt;height:22pt" href="https://mark.pdfcraft.invalid/attach/1">attach</a>
+      <a class="box" style="left:16pt;top:88pt;width:90pt;height:60pt" href="https://mark.pdfcraft.invalid/square/1">square</a>
+      <a class="box" style="left:120pt;top:92pt;width:90pt;height:60pt" href="https://mark.pdfcraft.invalid/circle/1">circle</a>
+      <a class="box" style="left:16pt;top:170pt;width:94pt;height:80pt" href="https://mark.pdfcraft.invalid/polygon/1">polygon</a>
+      <a class="box" style="left:120pt;top:170pt;width:96pt;height:80pt" href="https://mark.pdfcraft.invalid/polyline/1">polyline</a>
+      <a class="box" style="left:16pt;top:268pt;width:196pt;height:40pt" href="https://mark.pdfcraft.invalid/line/1">line</a>
+      <a class="box" style="left:16pt;top:322pt;width:196pt;height:50pt" href="https://mark.pdfcraft.invalid/ink/1">ink</a>
+      <a class="box" style="left:30pt;top:388pt;width:170pt;height:56pt" href="https://mark.pdfcraft.invalid/stamp/1">stamp</a>
     </div>
   </div>
   <div class="folio"><span>Review &amp; Markup</span><b>9</b></div>