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