javascript - standard feedback button in many sites? -


i noticed many website have nice 'feedback' button in page. appear on left side , displayed vertically 'f e e d b c k' .

see http://www.protectedplanet.net/ example.

i know (because not figure out) if achieved css transformation , javascript (and if how it) or if gif/jpg ?

thanks

p.s. rather guessing can people explain how works. example if people says it's image ?

it background image (for compatibility older browsers). text present in markup, positioned outside view-port.

the site supplied example uses image , feedback functionality widget: 

a#uservoice-feedback-tab {     background-color: #ff6600;     background-image: url("http://cdn.uservoice.com/images/widgets/en/feedback_tab_white.png"); }

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