You should develop with interoperability in mind as to develop your Web sites in a way that will work across devices and softwares.
Browser Market Shares
The global market share stats are hiding a lot of juicy details and you would be surprised by the data if you look at it closely. Statcounter is a way to get an idea of stats. Just be careful, because these are just collecting data with counters. But you could for example compared the world market shares for Desktop with the Russian Federation market shares.
Or you could check the world market shares for Mobile with the ones of let say Mexico and USA and you would notice that two neighboring countries have very different market shares.
Web Specifications supported by Opera
To get an understanding of what is supported or not supported yet by Opera, I would recommend you read the Web specifications support in Opera products. It gives a detailed list of the areas of support not only for Opera desktop but all type of Opera browsers (Mobile and Mini included).
If you check the user agent string, you can also get the version of the rendering engine, for example, Presto 2.10, and then head to the specific Web technologies support page for this engine. It would help to assess what are Web technologies supported.
Opera 对于有障碍的用户也特别有用，不能落后。您应该使用许多 HTML 功能来开发所有项目，以各种方式帮助有障碍的用户。可访问性应该是您主要关心的问题之一。
就 HTML 5 而言，并非所有浏览器都支持所有新元素。 HTML 5 仍然是一个正在进行中的规范，所有浏览器仍然与许多功能不兼容。这就是为什么有许多有用的方法来提高兼容性，例如 Modernizr。
考虑到这些，我肯定会考虑 Opera。
3% means millions of users. Opera is especially used in mobile devices (even old ones) and other devices, like consoles.
Opera is also especially useful for impaired users, which cannot be left behind. You should develop all your projects using the many HTML features to help impaired users in various ways. Accessibility should be one of your main concerns.
As far as HTML 5 concerns, not all new elements are supported by any browser out there. HTML 5 is still a work in progress specification, and all browsers are still incompatible with many features. This is why there are many useful ways to improve compatibility, for example Modernizr.
With these things in mind, I would surely take Opera into consideration.
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您应该在开发时考虑到互操作性，以便以跨设备和软件工作的方式开发您的网站。
浏览器市场份额
全球市场份额统计数据隐藏了许多有趣的细节，如果您仔细观察，您会对这些数据感到惊讶。 Statcounter 是一种获取统计信息想法的方法。请小心，因为这些只是用计数器收集数据。但您可以例如比较世界市场份额的桌面，带有俄罗斯联邦市场份额。
或者您可以查看移动设备的世界市场份额假设 墨西哥和美国和您会注意到两个邻国的市场份额截然不同。
Opera 支持的 Web 规范
要了解 Opera 支持或不支持的内容，我建议您阅读 Opera 产品中的 Web 规范支持。它不仅提供了 Opera 桌面支持领域的详细列表，还提供了所有类型的 Opera 浏览器（包括 Mobile 和 Mini）的支持领域的详细列表。
如果检查用户代理字符串，还可以获取渲染引擎的版本，例如 Presto 2.10，然后前往特定的 此引擎的 Web 技术支持页面。它将有助于评估支持哪些 Web 技术。
另一个可以帮助您评估跨浏览器对 Web 功能的支持情况的好网站是我何时可以使用。例如对于 CSS 动画 和 CSS 过渡。
You should develop with interoperability in mind as to develop your Web sites in a way that will work across devices and softwares.
Browser Market Shares
The global market share stats are hiding a lot of juicy details and you would be surprised by the data if you look at it closely. Statcounter is a way to get an idea of stats. Just be careful, because these are just collecting data with counters. But you could for example compared the world market shares for Desktop with the Russian Federation market shares.
Or you could check the world market shares for Mobile with the ones of let say Mexico and USA and you would notice that two neighboring countries have very different market shares.
Web Specifications supported by Opera
To get an understanding of what is supported or not supported yet by Opera, I would recommend you read the Web specifications support in Opera products. It gives a detailed list of the areas of support not only for Opera desktop but all type of Opera browsers (Mobile and Mini included).
If you check the user agent string, you can also get the version of the rendering engine, for example, Presto 2.10, and then head to the specific Web technologies support page for this engine. It would help to assess what are Web technologies supported.
Another good site that will help you assess the support of Web features across the browsers is When Can I use. For example for CSS Animation and CSS transitions.
3%意味着数百万用户。 Opera 特别用于移动设备（甚至是旧设备）和其他设备，例如控制台。
Opera 对于有障碍的用户也特别有用，不能落后。您应该使用许多 HTML 功能来开发所有项目，以各种方式帮助有障碍的用户。可访问性应该是您主要关心的问题之一。
就 HTML 5 而言，并非所有浏览器都支持所有新元素。 HTML 5 仍然是一个正在进行中的规范，所有浏览器仍然与许多功能不兼容。这就是为什么有许多有用的方法来提高兼容性，例如 Modernizr。
考虑到这些，我肯定会考虑 Opera。
3% means millions of users. Opera is especially used in mobile devices (even old ones) and other devices, like consoles.
Opera is also especially useful for impaired users, which cannot be left behind. You should develop all your projects using the many HTML features to help impaired users in various ways. Accessibility should be one of your main concerns.
As far as HTML 5 concerns, not all new elements are supported by any browser out there. HTML 5 is still a work in progress specification, and all browsers are still incompatible with many features. This is why there are many useful ways to improve compatibility, for example Modernizr.
With these things in mind, I would surely take Opera into consideration.