|Multiple Nice Pure CSS speech bubbles|
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The CSS file used in the demo page is heavily commented so that you can see which lines of code are responsible for each part of the effects.
Support: Firefox 3.5+, Safari 4+, Chrome 4+, Opera 10+, IE8+.
This is an example of how to create a basic speech bubble with a few enhancements. For further examples see the demo page and the heavily commented CSS file that it uses.
A note on progressive enhancement
This approach is one of progressive enhancement. Styles are built up in layers from simple coloured boxes, to boxes with a “speech tick” of some kind, to rounded rectangles or circles with gradient backgrounds. Browsers render the styles that they are capable of rendering.
Browsers (such as IE6 and IE7) that do not adequately support CSS 2.1 or those (such as IE8) without support for the necessary CSS3 properties will not look broken; they will simply not get the full speech bubble effect. However…
A warning about Firefox 3.0
Firefox 3.0 supports the necessary CSS 2.1 pseudo-elements but does not support the positioning of generated content.
Some of the examples are close to what I consider to be unacceptably broken in Firefox 3.0. It is the only browser above 2% market share — currently at ~4% as of March 2010 according to NetApplications — that cannot handle even the basic speech bubble effects.
Before applying this technique, consider the importance of Firefox 3.0 support and the percentage of your visitors currently using this browser. Eventually it will become a rare browser but due to it’s partial CSS 2.1 support you should be aware that there is no graceful fallback for Firefox 3.0 when using this technique.
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