| Style Element | Outlook 2000/03 | Live Hotmail | Yahoo! | Yahoo! Classic | Outlook 2007/10 | Apple | Apple iPhone | Google Gmail | Lotus Notes 6/7 | Lotus Notes 8.5 | AOL Desk 10 |
| <style> in <head> |  | | | | | | |  | | | |
| <style> in <body> | | | | | | | | | | | |
| Link Element | Outlook 2000/03 | Live Hotmail | Yahoo! | Yahoo! Classic | Outlook 2007/10 | Apple | Apple iPhone | Google Gmail | Lotus Notes 6/7 | Lotus Notes 8.5 | AOL Desk 10 |
| <link> in <head> | | | | | | | | | | | |
| <link> in <body> | | | | | | | | | | | |
| Selectors | Outlook 2000/03 | Live Hotmail | Yahoo! | Yahoo! Classic | Outlook 2007/10 | Apple | Apple iPhone | Google Gmail | Lotus Notes 6/7 | Lotus Notes 8.5 | AOL Desk 10 |
| e | | | | | | | | | | | |
| * | | | | | | | | | | | |
| e.className | | | | | | | | | | | |
| e#id | | | | | | | | | | | |
| e:link | | | | | | | | | | | |
| e:active, e:hover | | | | | | | | | | | |
| e:first-line | | | | | | | | | | | |
| e:first-letter | | | | | | | | | | | |
| e > f | | | | | | | | | | | |
| e:focus | | | | | | | | | | | |
| e+f | | | | | | | | | | | |
| e[foo] | | | | | | | | | | | |
| Text & Fonts | Outlook 2000/03 | Live Hotmail | Yahoo! | Yahoo! Classic | Outlook 2007/10 | Apple | Apple iPhone | Google Gmail | Lotus Notes 6/7 | Lotus Notes 8.5 | AOL Desk 10 |
| direction | | | | | | | | | | | |
| font | | | | | | | | | | | |
| font-family | | | | | | | | | | | |
| font-style | | | | | | | | | | | |
| font-variant | | | | | | | | | | | |
| font-size | | | | | | | | | | | |
| font-weight | | | | | | | | | | | |
| letter-spacing | | | | | | | | | | | |
| line-height | | | | | | | | | | | |
| text-align | | | | | | | | | | | |
| text-decoration | | | | | | | | | | | |
| text-indent | | | | | | | | | | | |
| text-overflow CSS3 |  | | | | | | | | | | |
| text-shadow CSS3 | | | | | | | | | | | |
| text-transform | | | | | | | | | | | |
| white-space | | | | | | | | | | | |
| word-spacing | | | | | | | | | | | |
| word-wrap CSS3 | | | | | | | | | | | |
| vertical-align | | | | | | | | | | | |
| Color & Background | Outlook 2000/03 | Live Hotmail | Yahoo! | Yahoo! Classic | Outlook 2007/10 | Apple | Apple iPhone | Google Gmail | Lotus Notes 6/7 | Lotus Notes 8.5 | AOL Desk 10 |
| color | | | | | | | | | | | |
| background | | | | | | | | | | | |
| -moz-background CSS3 | | | | | | | | | | | |
| -webkit-background CSS3 | | | | | | | | | | | |
| background-color | | | | | | | | | | | |
| background-image | | | | | | | | | | | |
| background-position | | | | | | | | | | | |
| background-repeat | | | | | | | | | | | |
| -khtml-background-size CSS3 | | | | | | | | | | | |
| -moz-background-size CSS3 | | | | | | | | | | | |
| -o-background-size CSS3 | | | | | | | | | | | |
| -webkit-background-size CSS3 | | | | | | | | | | | |
| HSL Colors CSS3 | | | | | | | | | | | |
| HSLA Colors CSS3 | | | | | | | | | | | |
| Opacity CSS3 | | | | | | | | | | | |
| RGBA Colors CSS3 | | | | | | | | | | | |
| Box Model | Outlook 2000/03 | Live Hotmail | Yahoo! | Yahoo! Classic | Outlook 2007/10 | Apple | Apple iPhone | Google Gmail | Lotus Notes 6/7 | Lotus Notes 8.5 | AOL Desk 10 |
| border | | | | | | | | | | | |
| -moz-border-color CSS3 | | | | | | | | | | | |
| -moz-border-image CSS3 | | | | | | | | | | | |
| -moz-border-radius CSS3 | | | | | | | | | | | |
| -webkit-border-radius CSS3 | | | | | | | | | | | |
| -moz-box-shadow CSS3 | | | | | | | | | | | |
| -moz-box-sizing CSS3 | | | | | | | | | | | |
| height | | | | | | | | | | | |
| margin | | | | | | | | | | | |
| padding | | | | | | | | | | | |
| width | | | | | | | | | | | |
| Positioning & Display | Outlook 2000/03 | Live Hotmail | Yahoo! | Yahoo! Classic | Outlook 2007/10 | Apple | Apple iPhone | Google Gmail | Lotus Notes 6/7 | Lotus Notes 8.5 | AOL Desk 10 |
| bottom | | | | | | | | | | | |
| clear | | | | | | | | | | | |
| clip | | | | | | | | | | | |
| cursor | | | | | | | | | | | |
| display | | | | | | | | | | | |
| float | | | | | | | | | | | |
| left | | | | | | | | | | | |
| opacity | | | | | | | | | | | |
| outline CSS3 | | | | | | | | | | | |
| overflow | | | | | | | | | | | |
| position | | | | | | | | | | | |
| resize CSS3 | | | | | | | | | | | |
| right | | | | | | | | | | | |
| top | | | | | | | | | | | |
| visibility | | | | | | | | | | | |
| z-index | | | | | | | | | | | |
| Lists | Outlook 2000/03 | Live Hotmail | Yahoo! | Yahoo! Classic | Outlook 2007/10 | Apple | Apple iPhone | Google Gmail | Lotus Notes 6/7 | Lotus Notes 8.5 | AOL Desk 10 |
| list-style-image | | | | | | | | | | | |
| list-style-position | | | | | | | | | | | |
| list-style-type | | | | | | | | | | | |
| Tables | Outlook 2000/03 | Live Hotmail | Yahoo! | Yahoo! Classic | Outlook 2007/10 | Apple | Apple iPhone | Google Gmail | Lotus Notes 6/7 | Lotus Notes 8.5 | AOL Desk 10 |
| border-collapse | | | | | | | | | | | |
| border-spacing | | | | | | | | | | | |
| caption-side | | | | | | | | | | | |
| empty-cells | | | | | | | | | | | |
| table-layout | | | | | | | | | | | |
| Total Market Share | 28% | 16% | 14% | 9% | 8% | 7% | 6% | 1% | 1% | ||