css - 黑莓媒体查询

Question

我正在尝试使我的网站版本针对黑莓设备进行优化，但是我缺少有关此设备的信息，而且谷歌似乎也无济于事。

以前有人为黑莓创建过网站优化吗？或者知道任何类型的帖子或信息可以提供帮助？

我不知道媒体查询是否有帮助，因为这些设备似乎打开屏幕标准分辨率。

Answer 1

来自 Optimizing A Web Site For BlackBerry Devices :

If you thought targeting Web sites to work with several different browsers was difficult enough, try throwing BlackBerry support in the mix. Designing a Web site to work with BlackBerry handheld devices can be frustrating because the BlackBerry Web browser has fewer capabilities than a standard Web browser. This lack of features greatly affects design strategy because slower download speeds and limited screen size must now be factored in.

The first thing you should do when optimizing a site to support BlackBerry devices is download and install the official BlackBerry Device Simulator and BlackBerry Email and MDS Services Simulator Package. The device simulator and simulator package emulate the functionality of actual BlackBerry products and allow you to access and test a Web site in a virtual environment.

When you first open a site in emulation, you'll probably notice the BlackBerry's CSS support is limited and your site may not look so great. Since most front-end developers are trained to be reactive, your initial solution maybe to attach another stylesheet, target the handheld medium and adjust the classes and ids in that stylesheet accordingly. Unfortunately, the BlackBerry disregards both screen and handheld media style declarations. In fact, many of the useful style declarations that could create a loophole for the lack of media support—including display:none and visiblility:hidden—won't work on a BlackBerry. For a complete list of supported CSS declarations, refer to the BlackBerry Content Developer Guide.

So what's the solution? The real trick to optimizing a Web site for BlackBerry devices (without any hacks or work-arounds) is using well-formed XHTML in conjunction with CSS and omitting unnecessary layout elements using the screen medium. This focus on semantically correct XHTML to drive your layout may not look pretty on the BlackBerry, but it's advantageous for several reasons. For starters, since you're dealing with a limited amount of screen space and relying on what equates to dial-up connection speeds you want to keep the majority of your display content for the BlackBerry as text-based. Secondly, the well-formed code will result in better overall search engine optimization because you're using code standards that are friendlier to the search engine indexing process. Finally, the focus on semantics will make the site scalable and rid you of any worries associated with the consequences of adding text, modifying links or changing the appearance of an element in your stylesheet.

With full-featured browsers integrated into the latest generation of handhelds (Safari on the iPhone, IE in Windows Mobile devices) aesthetics support on mobile devices is vastly improving. Either way, good coding standards promote graceful degradation and a provide a certain level of future proofing that ensures users can view a Web site no matter how outdated or cutting-edge their device is.