Add HTML colour palette template
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templates/palette.html
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templates/palette.html
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<h1>A colour palette in plain HTML</h1>
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<section class="box">
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A template colour palette written as a self-contained HTML file.
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New palettes can be created easily by copying the file and changing a few CSS variables.
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</section>
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<!-- TODO: Change the base hue and offset here -->
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<section style="--base-hue: 200deg; --saturation: 80%; --offset: calc(360deg / 3)">
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<h2>Primary</h2>
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<!-- Only override values here for slight tweaking -->
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<div class="colors" style="--hue: var(--base-hue);">
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<span style="--lightness: 10%"></span>
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<span style="--lightness: 20%"></span>
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<span style="--lightness: 30%"></span>
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<span style="--lightness: 40%"></span>
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<span style="--lightness: 50%"></span>
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<span style="--lightness: 60%"></span>
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<span style="--lightness: 70%"></span>
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<span style="--lightness: 80%"></span>
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<span style="--lightness: 90%"></span>
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</div>
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<section class="info box">
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<b>Hint:</b>
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Modify as needed by changing the <code>--hue</code> attribute in the inlined CSS.<br>
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Usage of a separate color picker tool for this step might be preferable.<br>
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</section>
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<h2>Secondary</h2>
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<div class="colors" style="--hue: calc(var(--base-hue) + var(--offset));">
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<span style="--lightness: 10%"></span>
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<span style="--lightness: 20%"></span>
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<span style="--lightness: 30%"></span>
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<span style="--lightness: 40%"></span>
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<span style="--lightness: 50%"></span>
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<span style="--lightness: 60%"></span>
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<span style="--lightness: 70%"></span>
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<span style="--lightness: 80%"></span>
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<span style="--lightness: 90%"></span>
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</div>
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<section class="info box">
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<b>Hint:</b>
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You can copy any colour to the clipboard by just clicking on its box.
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By default colours are copied as HSLA values.
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This can be changed in the script block at the bottom of the document.
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</section>
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<h2>Secondary</h2>
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<div class="colors" style="--hue: calc(var(--base-hue) - var(--offset));">
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<span style="--lightness: 10%"></span>
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<span style="--lightness: 20%"></span>
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<span style="--lightness: 30%"></span>
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<span style="--lightness: 40%"></span>
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<span style="--lightness: 50%"></span>
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<span style="--lightness: 60%"></span>
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<span style="--lightness: 70%"></span>
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<span style="--lightness: 80%"></span>
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<span style="--lightness: 90%"></span>
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</div>
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<section class="info box">
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<b>Hint:</b>
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By making use of <code>calc</code> and <code>var</code>, most of the colour palette can be automated.
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This makes it easier and quicker to make adjustments.
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</section>
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</section>
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<!-- ======================================== -->
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<!-- ===== STYLES AND APPLICATION LOGIC ===== -->
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<!-- ======================================== -->
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<style>
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:root {
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font-size: 1em;
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color: hsl(220deg, 8%, 20%);
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color: hsl(220deg, 8%, 20%);
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font-family: "Open Sans", sans-serif;
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}
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* {
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box-sizing: border-box;
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}
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code {
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font-family: "Hack", monospace;
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}
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body {
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display: flex;
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flex-flow: column nowrap;
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align-items: center;
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background: white;
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}
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/* The following only does font size shenanigans! */
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h1, h2 {
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text-align: center;
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font-weight: normal;
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font-family: "Raleway", "Quicksand", serif;
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}
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h1 {
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font-size: 2.4em;
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--border: dotted .08em currentcolor;
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border-bottom: var(--border);
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border-top: var(---border);
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width: calc((3rem + .6rem * 2) * 9);
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text-align: center;
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padding: .2em 0;
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}
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h2 {
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font-size: 2em;
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}
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.box {
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--radius: .3em;
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width: calc((3rem + .6rem * 2) * 9);
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font-style: italic;
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border-radius: var(--radius);
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background-color: hsl(220deg, 14%, 96%);
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box-shadow: .0em .1em .2em inset hsl(220deg, 8%, 80%);
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padding: 1em 2em;
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position: relative;
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margin: 2em 0em;
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}
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.info, .success, .accept { --color: rgb(102, 204, 51); }
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.warning, .acknowledge { --color: rgb(230, 182, 25); }
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.error, .cancel { --color: rgb(204, 51, 77); }
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.box::before {
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display: block;
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position: absolute;
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left: 0;
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top: 0;
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height: 100%;
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width: .4em;
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background-color: var(--color, transparent);
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border-radius: var(--radius) 0 0 var(--radius);
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content: '';
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}
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div.colors {
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--separation2: .6em; /* Halved separation */
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display: flex;
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/* padding: var(--separation2); */
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}
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div.colors span {
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background: hsl(var(--hue), var(--saturation, 50%), var(--lightness, 50%));
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border-radius: .4em;
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width: 3em;
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height: 3em;
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margin: var(--separation2);
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box-shadow: .1em .1em .8em hsla(calc(var(--hue) + 30deg), calc(100% - var(--lightness) - 10%), calc(var(--lightness) - 40%), .4) inset;
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}
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@keyframes fade {
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0% { opacity: 0; transform: translate(-50%, -10%)}
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20% { opacity: 1;}
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50% { opacity: 1;}
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100% { opacity: 0; transform: translate(-50%, -150%)}
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}
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div.notification {
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top: 0em;
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border: 1px solid currentcolor;
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background: hsla(0deg, 0%, 100%, .8);
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font-size: 1em;
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opacity: 0;
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position: fixed;
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padding: .4em; 1em;
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font-weight: bold;
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text-align: center;
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}
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[center] { text-align: center; }
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</style>
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<script>
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const show_message = function(message, color, x, y) {
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let box = document.createElement('div');
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box.innerHTML = message;
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box.classList.add('notification');
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if (x) box.style.left = x+"px";
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if (y) box.style.top = y+"px";
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document.querySelector("body").appendChild(box);
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box.style.setProperty('animation', 'fade 1s');
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box.style.setProperty('animation-fill-mode', 'forwards');
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box.style.setProperty('color', color);
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box.addEventListener("animationend", ({box: target}) => box.parentElement.removeChild(box))
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}
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window.addEventListener("load", function() {
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document.querySelectorAll('div.colors span').forEach(function(span) {
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span.addEventListener('click', function(event) {
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let prop = name => getComputedStyle(event.target).getPropertyValue(name)
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let hsla = `hsla(${prop("--hue")}, ${prop("--saturation")}, ${prop("--lightness")}, 1)`
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navigator.clipboard.writeText(hsla).then(function() {
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show_message(`Copied to Clipboard:<br>${hsla}`, hsla, event.clientX, event.clientY);
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}, function(err) {
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console.error('Async: Could not copy text: ', err);
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});
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});
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span.style.setProperty('cursor', 'pointer');
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});
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})
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</script>
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