HTML5 PLease

Problem Area: Keeping track of the ever-evolving HTML5 and CSS 3 support in today’s web browsers. We can use  CSS animations to create some whiz-bang effects, but should you? Which browsers support it? What should you do about older browsers?
The HTML Please site, as first reported by Webmonkey, offers up expert advice on which features to use and not use when developing apps. The site breaks its advice down into three categories: Use, Use with caution or Avoid. In addition, it tells developers which features they should use with fallbacks or polyfills. The bottom line is the new site gives developers recommendations on which HTML5 and CSS 3 elements they can safely use to create apps and sites that are effectively supported across a range of browsers.
It is the brainchild of several folks including Divya Manian who provides an informative back story about how it all got started and was over a year in the making. The list of contributors also includes Paul Irish, Tim Branyen, Connor Montgomery, Jake Verbaten and more. The list includes folks from HTML5 Boilerplate, Modernizr, and CSS3 Please.
The Website is liked to website When Can I Use provides you with compatibility tables for browser support of HTML5, CSS3, SVG, and more for desktop and mobile browsers. Ex: place the attribute name box-reflect.

1. The mage page search and Explore options provide filtering depending on three main designations:

•those that can be used now with fallback and Polyfills recommendations
•those to use with caution
•those features to avoid altogether
Each HTML5 feature listing provides the suggested use status, a brief description, and links to When I can Use to view browser share percentages for that particular element/feature

1. This tool is quite useful, especially in cases where your customer might be limited to one or two browsers

2.       The mage page search and Explore options provide filtering depending on three main designations:

•those that can be used now with fallback and Polyfills recommendations

•those to use with caution

•those features to avoid altogether

Each HTML5 feature listing provides the suggested use status, a brief description, and links to When I can Use to view browser share percentages for that particular element/feature
There is also a Browser comparison button where you can select two browsers to compare. A new table is generated, for example, Firefox 12.0 and Chrome 16.0 result in the partial table

1. This tool is quite useful, especially in cases where your customer might be limited to one or two browsers.
2. The goal is to help developers “use the new and shiny responsibly.” As per the customer browser requirements.

Source:http://html5please.com/