浏览器和移动设备的支持情况

了解 Bootstrap 所支持的新和旧的浏览器和设备，以及每种浏览器和设备的已知问题和 bug。

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支持的浏览器

Bootstrap 支持所有主流浏览器和平台的 最新、稳定版本。

对于其它使用了最新版本的 WebKit、Blink 或 Gecko 内核的浏览器，或者直接或间接调用了平台的 web view API，都不是明确被支持的。但是，Bootstrap 应该（大多数情况下）在这些浏览器中是能够正常显示和运行的。下面列出了更具体地支持情况。

你可以在 .browserslistrc 文件 中找到 Bootstrap 所支持地浏览器及版本列表：

# https://github.com/browserslist/browserslist#readme

>= 0.5%
last 2 major versions
not dead
Chrome >= 60
Firefox >= 60
Firefox ESR
iOS >= 12
Safari >= 12
not Explorer <= 11

我们使用 Autoprefixer 来自动添加特定于浏览器厂商地 CSS 属性前缀，并使用 Browserslist 来对浏览器地版本进行管理。请查阅这些工具各自地文档，以了解如何将这些工具集成到你的项目中。

移动设备

一般来说，Bootstrap 支持每个主要平台上的默认浏览器的最新版本。请主要，基于代理（proxy）模式的浏览器（例如 Opera Mini、Opera Mobile’s Turbo mode、UC Browser Mini、Amazon Silk，这些浏览器自身并不具备完整的页面渲染能力）是不被支持的。

	Chrome	Firefox	Safari	Android Browser & WebView
Android	Supported	Supported	—	v6.0+
iOS	Supported	Supported	Supported	—

桌面浏览器

同样，大多数桌面浏览器的最新版本是被支持的。

	Chrome	Firefox	Microsoft Edge	Opera	Safari
Mac	Supported	Supported	Supported	Supported	Supported
Windows	Supported	Supported	Supported	Supported	—

对于 Firefox 浏览器，除了最新的常规稳定版本外，我们还支持最新的 Extended Support Release (ESR) 版本。

虽然 Bootstrap 在 Chromium、Linux 版 Chrome、Linux 版 Firefox 上也表现地很不错，但这些浏览器或版本是不被 Bootstrap 官方支持的。

IE 浏览器

Bootstrap v5 版本不支持 IE 浏览器！ 如果你需要支持 IE，请使用 Bootstrap v4 版本。

Modals and dropdowns on mobile

Overflow and scrolling

Support for overflow: hidden; on the <body> element is quite limited in iOS and Android. To that end, when you scroll past the top or bottom of a modal in either of those devices’ browsers, the <body> content will begin to scroll. See Chrome bug #175502 (fixed in Chrome v40) and WebKit bug #153852.

iOS text fields and scrolling

As of iOS 9.2, while a modal is open, if the initial touch of a scroll gesture is within the boundary of a textual <input> or a <textarea>, the <body> content underneath the modal will be scrolled instead of the modal itself. See WebKit bug #153856.

The .dropdown-backdrop element isn’t used on iOS in the nav because of the complexity of z-indexing. Thus, to close dropdowns in navbars, you must directly click the dropdown element (or any other element which will fire a click event in iOS).

Browser zooming

Page zooming inevitably presents rendering artifacts in some components, both in Bootstrap and the rest of the web. Depending on the issue, we may be able to fix it (search first and then open an issue if need be). However, we tend to ignore these as they often have no direct solution other than hacky workarounds.

Validators

In order to provide the best possible experience to old and buggy browsers, Bootstrap uses CSS browser hacks in several places to target special CSS to certain browser versions in order to work around bugs in the browsers themselves. These hacks understandably cause CSS validators to complain that they are invalid. In a couple places, we also use bleeding-edge CSS features that aren’t yet fully standardized, but these are used purely for progressive enhancement.

These validation warnings don’t matter in practice since the non-hacky portion of our CSS does fully validate and the hacky portions don’t interfere with the proper functioning of the non-hacky portion, hence why we deliberately ignore these particular warnings.

Our HTML docs likewise have some trivial and inconsequential HTML validation warnings due to our inclusion of a workaround for a certain Firefox bug.