Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The ::-moz-progress-bar CSS pseudo-element is a Mozilla extension that represents the progress bar inside a <progress> element. (The bar represents the amount of progress that has been made.)
If you want to select the unfinished part of <progress> in Mozilla, please select the <progress> directly.
::-moz-progress-bar
<progress value="30" max="100">30%</progress> <progress max="100">Indeterminate</progress>
::-moz-progress-bar {
background-color: red;
}
/* Force indeterminate bars to have zero width */
:indeterminate::-moz-progress-bar {
width: 0;
} Not part of any standard.
<progress>::-ms-fill::-webkit-progress-bar::-webkit-progress-value::-webkit-progress-inner-element
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/::-moz-progress-bar