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# M14-04GChromium responsive layout no-overlap/no-overflow matrix
- `task`: `M14-04G`
- `parent`: `M14-04F`
- `status`: `done`
## 目标
在 Chromium 主线程 WebGL 和 OffscreenCanvas Worker 两种生产视口下,验证桌面、平板和手机
尺寸不会产生横向溢出、关键区域重叠、文字裁切或不可操作的触控目标;布局失败必须能被
机器 checker 稳定报告。Firefox/WebKit 不在本项目范围内。
## 输入
- 上一个 manifest`tests/golden/M14-04F/manifest.json`
- 生产布局入口:`web/app/src/app/App.tsx``web/app/src/app/app-shell.css`
- 视口入口:`web/app/src/three-adapter/viewport.ts``web/app/src/three-adapter/offscreen-viewport.ts`
- 既有 e2e 参考:`web/tests/e2e/responsive-layout.spec.ts`
## 范围
做:
- 固定 `1440x900``1280x720``834x1112``390x844` 四个 Chromium viewport。
- 分别验证 `offscreen=0``offscreen=1`,记录实际 renderer backend。
- 检查 document 横向滚动、topbar、sidebar、viewport、timeline、status bar 的 bounding box。
- 检查长项目名、错误提示、打开进度、面板展开和 DPR 2 下文字与按钮仍在容器内。
- 记录失败元素、测量值、viewport、DPR、backend 和报告 hash。
不做:
- Firefox/WebKit 兼容性证据。
- 完整 UI 重设计或新增 Blender 功能。
- 只用截图非空作为布局通过条件。
## 验收
```text
npm --prefix web run test:chromium-layout
```
必要的补充门:
```text
npm --prefix web run typecheck
npm --prefix web run build
git diff --check
```
## 产物和交接
- 报告:`tests/golden/M14-04G/chromium-layout-report.json`
- manifest`tests/golden/M14-04G/manifest.json`
- 状态页:`docs/status/M14-04G.md`
- 下一任务:由 manifest 的 `nextTask` 决定
## 回滚
删除布局 checker、测试、报告、manifest、package 命令和本任务状态页;恢复 `M14-04F` 作为队列尾,
不得修改 M14-04F 的成功证据。