BackstopJS 是自动 CSS 回归测试工具，它通过比较不同视窗大小的 DOM 截图来回应你所测试的 Web 界面。可以识别出两个不同视角上的网页差异。
{ "viewports": [
{
"name": "phone", "width": 320, "height": 480
},
{
"name": "tablet_v", "width": 568, "height": 1024
},
{
"name": "tablet_h", "width": 1024, "height": 768
}
],
"scenarios": [
{
"label": "http://getbootstrap.com",
"url": "http://getbootstrap.com",
"hideSelectors": [],
"removeSelectors": [
"#carbonads-container"
],
"selectors": [
"header",
"main",
"body .bs-docs-featurette:nth-of-type(1)",
"body .bs-docs-featurette:nth-of-type(2)",
"footer",
"body"
],
"readyEvent": null,
"delay": 500
}
]
}
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