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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <audio class="customPlayer" src="https://media.transistor.fm/89b216fe" title="Trailer" data-artist="A Question of Code" controls>
  Your browser does not support the <code>audio</code> element.
</audio>

<p style="font-family:sans-serif;">Built using <a href="https://github.com/tomhazledine/picobel">Picobel.js</a></p>
!

CSS 

              
                .skeleton.picobel {
    --black: #555;
    --white: #ffffff;
    --grey: #ddd;
    --focus: #015ecc;

    --progress-height: 32px;
    --progress-inner-height: 30px;
}

/* Global */
.skeleton.picobel *,
.skeleton.picobel *:before,
.skeleton.picobel *:after {
    box-sizing: inherit;
}
.skeleton.picobel *:focus {
    outline: 2px solid var(--focus);
    outline-offset: 1px;
    border-radius: 2px;
}
.skeleton.picobel {
    font-size: inherit;
    position: relative;
    box-sizing: border-box;
    z-index: 1;

    /* Wrapper */
    margin: 10px 0;
    height: 64px;
    border: 1px solid var(--black);
}

/* Simulates an infinite slide-to-the-right effect. */
@keyframes background_slide {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 20px 0;
    }
}

/* The loading-state indicator */
.skeleton__loader {
    position: absolute;
    display: none;
    z-index: 5;
    bottom: -1px;
    left: 183px;
    right: 0;
    height: var(--progress-height);
    border-top: 1px solid var(--black);
    border-bottom: 1px solid var(--black);
    background: linear-gradient(to right, var(--white) 50%, var(--black) 50%);
    background-size: 20px 20px;
    background-repeat: repeat;
    background-position: 0 0;
    animation: background_slide linear infinite 0.4s;
}

/* Only show the loader when we're loading */
.skeleton.loading .skeleton__loader {
    display: block;
}

/* The play-pause button */
.skeleton__play-pause {
    font-size: 10px;
    border: 1px solid var(--black);
    appearance: none;
    width: 64px;
    height: 64px;
    background: var(--white);
    position: absolute;
    top: -1px;
    left: -1px;
    cursor: pointer;
}

.skeleton__play-pause__text {
    display: none;
}

.skeleton__play-pause:focus {
    z-index: 3;
}

/* The "play" icon */
.skeleton__play-pause:before {
    content: "";
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-40%, -50%);
    border-top: 10px solid transparent;
    border-left: 12px solid var(--black);
    border-bottom: 10px solid transparent;
}

/* The "pause" icon */
.skeleton__play-pause.playing:before {
    height: 18px;
    width: 16px;
    transform: translate(-50%, -50%);
    border-top: 0;
    border-left: 6px solid var(--black);
    border-right: 6px solid var(--black);
    border-bottom: 0;
}

/* Display song info */
.skeleton__wrapper--title-artist {
    padding: 0 10px 0 74px;
    height: 64px;
    background: var(--white);
    color: var(--black);
    line-height: 1.6;
}
.skeleton__title {
    display: inline-block;
    line-height: 1;
    font-weight: bold;
    font-family: monospace;
}

.skeleton__artist {
    font-family: monospace;
    display: inline-block;
    margin-left: 5px;
    line-height: 1;
}
.skeleton__artist:not(:empty):before {
    content: " – ";
}

/* Display info about time-played and song-duration */
.skeleton__wrapper--timer-progress-duration {
    position: absolute;
    bottom: -1px;
    left: 182px;
    right: 0;
    height: 32px;
    border-left: 1px solid var(--black);
}
.skeleton__timer,
.skeleton__duration {
    position: absolute;
    bottom: 0;
    z-index: 4;
    width: 60px;
    text-align: left;
    background: transparent;
    color: var(--black);
    line-height: 1;
    pointer-events: none;
    font-size: 14px;
    height: 32px;
    padding: 10px 5px 9px 10px;
    font-family: monospace;
}
.skeleton__timer {
    left: 0;
}
.skeleton__duration {
    right: 0;
    text-align: right;
}

/* Hide song-timings when we're loading */
.skeleton.loading .skeleton__timer,
.skeleton.loading .skeleton__duration {
    display: none;
}

/* The "fake" range slider */
.skeleton__progress-slider__wrapper {
    height: var(--progress-height);
    font-size: 10px;
    line-height: 1;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
}
.skeleton__progress-slider__replacement {
    position: relative;
    background: var(--white);
    border-top: 1px solid var(--black);
    border-bottom: 1px solid var(--black);
    height: var(--progress-height);
    overflow: hidden;
}
.skeleton__progress-slider__replacement.focus {
    outline: 2px solid var(--focus);
    outline-offset: 1px;
    border-radius: 2px;
    z-index: 3;
}
.skeleton__progress-slider__indicator {
    height: var(--progress-inner-height);
    position: absolute;
    top: 0;
    left: 0;
    background: var(--grey);
    width: 0%;
}
.skeleton__progress-slider__playhead {
    width: 8px;
    height: var(--progress-inner-height);
    position: absolute;
    top: 0;
    left: 0%;
    margin-left: -4px;
    background: var(--black);
}

/* Hide dynamic elements until loading has finished */
.skeleton.loading .skeleton__progress-slider__indicator,
.skeleton.loading .skeleton__progress-slider__playhead {
    display: none;
}

/* Make sure the real range element is the same size as the fake one. Position it on-top of the fake and make it invisible (so we can still get the functionality) */
.skeleton__progress-slider__range {
    width: 100%;
    height: var(--progress-height);
    padding: 0;
    margin: 0;
    z-index: 4;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
}

/* Make sure the range Track is the right size and shape. Needs prefixed versions to ensure cross-browser consistency. */
.skeleton__progress-slider__range::-webkit-slider-runnable-track {
    width: 100%;
    height: var(--progress-height);
    cursor: pointer;
}
.skeleton__progress-slider__range::-moz-range-track {
    width: 100%;
    height: var(--progress-height);
    cursor: pointer;
}
.skeleton__progress-slider__range::-ms-track {
    width: 100%;
    height: var(--progress-height);
    cursor: pointer;
}

/* Position the volume controls */
.skeleton__wrapper--mute-volume {
    position: absolute;
    bottom: -1px;
    left: 62px;
    width: 120px;
    height: 32px;
    z-index: 2;
    border-top: 1px solid var(--black);
    border-bottom: 1px solid var(--black);
    background: var(--white);
    display: flex;
    align-items: center;
}
.skeleton__mute {
    display: block;
    z-index: 2;
    float: left;
    width: 32px;
    height: 32px;
    font-size: 10px;
    color: transparent;
    border: 0;
    appearance: none;
    background: var(--white);
    border: 1px solid var(--black);
    position: relative;
    cursor: pointer;
    overflow: hidden;
    flex-shrink: 0;
}

/* Rectangle part of "speaker cone" icon */
.skeleton__mute:before {
    display: block;
    width: 6px;
    height: 6px;
    position: absolute;
    content: "";
    top: 50%;
    right: 50%;
    margin-right: -1px;
    transform: translateY(-50%);
    background: var(--black);
}

/* Triangle part of "speaker cone" icon */
.skeleton__mute:after {
    display: block;
    width: 5px;
    height: 5px;
    position: absolute;
    content: "";
    top: 50%;
    transform: translateY(-50%);
    right: 50%;
    margin-right: -4px;
    border-top: 8px solid transparent;
    border-right: 8px solid var(--black);
    border-bottom: 8px solid transparent;
}

/* Change icon when muted */
.skeleton__mute.muted:before {
    background: var(--grey);
}
.skeleton__mute.muted:after {
    border-right-color: var(--grey);
}

.skeleton__volume {
    --volume-padding: 6px;
    --volume-height: 20px;
    --volume-width: 76px;
    width: var(--volume-width) + var(--volume-padding) * 2;
    height: var(--volume-height) + var(--volume-padding) * 2;
    padding: var(--volume-padding);
}

.skeleton__volume-label {
    display: none;
}

/* As with the playback indicator, we're using a range element to power the volume slider functionality */
.skeleton__volume-slider__wrapper {
    width: var(--volume-width);
    height: var(--volume-height);
    position: relative;
}
.skeleton__volume-slider__replacement {
    display: block;
    height: var(--volume-height);
    width: var(--volume-width);
    position: relative;
    left: 0;
    z-index: 3;
    background: var(--grey);
    flex-grow: 1;
    float: left;
    transform: rotate(180deg);
}
.skeleton__volume-slider__replacement:after {
    content: "";
    display: block;
    border-right: var(--volume-width) solid var(--white);
    border-top: var(--volume-height) solid transparent;
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
}
.skeleton__volume-slider__replacement.focus {
    outline: 2px solid var(--focus);
    outline-offset: 1px;
    border-radius: 2px;
}

.skeleton__volume-slider__indicator {
    height: 100%;
    position: absolute;
    top: 0;
    right: 0;
    background: var(--black);
    width: var(--volume-width);
}
.skeleton__volume-slider__playhead {
    display: none;
}

/* Make sure the real range element is the same size as the fake one. Position it on-top of the fake and make it invisible (so we can still get the functionality) */
.skeleton__volume-slider__range {
    width: 100%;
    height: var(--volume-height);
    padding: 0;
    margin: 0;
    position: absolute;
    z-index: 4;
    top: 0;
    left: 0;
    opacity: 0;
}

/* Make sure the range Track is the right size and shape. Needs prefixed versions to ensure cross-browser consistency. */
.skeleton__volume-slider__range::-webkit-slider-runnable-track {
    width: 100%;
    height: var(--volume-height);
    cursor: pointer;
}
.skeleton__volume-slider__range::-moz-range-track {
    width: 100%;
    height: var(--volume-height);
    cursor: pointer;
}
.skeleton__volume-slider__range::-ms-track {
    width: 100%;
    height: var(--volume-height);
    cursor: pointer;
}
!

JS 

              
                import picobel from "https://esm.sh/picobel@3.0.0";

picobel({theme:'skeleton'});
!
999px

Console