Wall of People Groups: the poster's title and chart never flash at print size before the wall's zoom applies

plugin-designs/wall-of-people-groups/src/wallCanvas.js

@@ -96,9 +96,10 @@ export class WallCanvas {
       this.host.appendChild(this.ov)
       this.ovRoot = this.ov.attachShadow ? this.ov.attachShadow({ mode: 'open' }) : this.ov
     }
-    // The print CSS (its @page rule is ignored on screen), scoped by the shadow root.
+    // The print CSS (its @page rule is ignored on screen), scoped by the shadow root. The overlay starts at
+    // scale(0) and takes the zoom's transform on the next frame, so it never flashes at full print size.
     this.ovRoot.innerHTML = `<style>${sp.css}\n.ovw{position:absolute;left:0;top:0;transform-origin:0 0;pointer-events:none}.ovw a{pointer-events:auto}</style>`
-      + `<div class="ovw poster" style="width:${sp.worldW}px;height:${sp.worldH}px">${sp.chromeHtml}</div>`
+      + `<div class="ovw poster" style="width:${sp.worldW}px;height:${sp.worldH}px;transform:scale(0)">${sp.chromeHtml}</div>`
     this.ovw = this.ovRoot.querySelector('.ovw')
     this.showPoster(); this.resize()
   }