基线:全量源码首提(D1 版本控制落地,含第一轮优化 B1-B4/A1/A4/缩放修复)

2026-10-01 22:15:22 +08:00
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+# Browser Capability: viewport
+
+Use an explicit viewport only for responsive or device-size testing. Otherwise keep the normal IAB viewport.
+
+```js
+await tab.setViewportSize({ width: 1280, height: 720 });
+nodeRepl.write(JSON.stringify(tab.viewportSize()));
+```
+
+`setViewportSize()` automatically opens the IAB responsive canvas. Its width and height are CSS pixels,
+and responsive mode uses DPR 1 so a viewport screenshot has matching PNG pixel dimensions. Exiting
+responsive mode in the UI clears the override and restores the host's natural DPR.