W3C CSS validation gives "Parse Error" for opacity -


while testing css stylesheet personal website, following parse errors appeared opacity properties. why this? isn't opacity=70 perfect property filter alpha ie8 support?

.image-section #sliderleft  parse error opacity=70) .image-section #sliderright parse error opacity=70) .image-section #caption parse error [empty string]

here css code in error appears :

.image-section #caption {     position: absolute;     display: none;     bottom: 4px;     width: 100%;     text-align: center;     color: white;     background: #474747;     height: 50px;     line-height: 50px;     opacity: 0.8;     font-size: 20px; }  .image-section #sliderleft {     position: absolute;     display: none;     width: 25px;     height: 100px;     top: 50%;     margin-top: -25px;     left: 0;     opacity: 0.7;     filter: alpha(opacity=70);     border: 0; }  .image-section #sliderright {     position: absolute;     display: none;     width: 25px;     height: 100px;     top: 50%;     margin-top: -25px;     right: 0;     opacity: 0.7;     filter: alpha(opacity=70);     border: 0; }

w3c uses parsing engine not allow syntax alpha(opacity=70). there no css property in standard allow such definition format.

i cannot reproduce

parse error [empty string]

in .image-section #caption using

http://jigsaw.w3.org/css-validator/#validate_by_input


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