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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3-color@3"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3-hsluv"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/Myndex/SAPC-APCA@9833f25c1a4e4c01cb94cdac8238ac16609b96ec/JS/APCA_0_98G_4g_minimal.js"></script>
<script type="text/javascript" src="index.js"></script>
<style>
body, button, input, select, option {
/* taken from https://css-tricks.com/snippets/css/system-font-stack/ - wordpress style */
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
font-size: 1rem;
min-width: 175px;
box-sizing: border-box;
}
input, button {
padding: 5px 2px;
}
button {
cursor: pointer;
}
select {
padding: 5px 0;
}
.container {
max-width: 640px;
margin: auto;
}
.intro {
margin: 20px 50px 30px;
text-align: center;
}
.formGrid {
display: grid;
width: fit-content;
grid-template-columns: auto auto;
align-items: baseline;
gap: 20px;
margin-bottom: 40px;
}
.formGrid label {
text-align: right;
color: #555;
white-space: nowrap;
}
#content-purpose-desc {
max-width: 440px;
color: #555;
margin-top: 10px;
}
.formGrid-leftHandNote {
text-align: right;
max-width: 250px;
align-self: flex-start;
color: #555;
}
#font-weight {
vertical-align: middle;
}
#text-color, #bg-color {
min-width: auto;
width: 140px;
}
.colorChangeButtonWrapper {
display: inline-block;
background: linear-gradient(45deg, rgba(2,0,36,0) 0%, rgba(0,0,0,0) 40%, rgba(128,128,128,0.5) 50%, rgba(0,0,0,0) 60%, rgba(0,212,255,0) 100%);
}
#text-color-change, #bg-color-change {
display: inline-block;
border: 2px solid #bababa;
min-width: auto;
width: 32px;
background: transparent;
}
#swap-colors {
background-color: transparent;
position: absolute;
top: -20px;
left: 147px;
width: 25px;
min-width: auto;
font-size: 14px;
line-height: 1;
padding: 2px;
border: none;
cursor: pointer;
}
.boldEm {
font-weight: 600;
font-style: normal;
}
#error:not(:empty) {
color: maroon;
max-width: 440px;
}
#preview-area {
display: inline-block;
text-align: center;
}
#preview-bg-color {
min-height: 90px;
font-size: 16px;
display: flex;
align-items: center;
justify-content: center;
position: relative;
}
#preview-text-color {
padding: 0 1em;
}
#preview-text-color:not(:empty)::before {
content: '';
position: absolute;
left: 0;
bottom: 0;
right: 0;
height: 2px;
background-color: currentColor;
}
#preview-note:not(:empty) {
margin-top: 5px;
text-align: center;
}
</style>
</head>
<body onload="attach()">
<div class="container">
<p class="intro">
Fill in text or background color to find the other. Or fill in both to check if contrast passes.
</p>
<div class="formGrid">
<label for="text-color">Text color</label>
<div>
<input type="text" id="text-color" />
<span class="colorChangeButtonWrapper"><button id="text-color-change" aria-label="Adjust Color"><span aria-hidden="true"> </span></button></span>
</div>
<label for="bg-color">Background color</label>
<div style="position: relative">
<input type="text" id="bg-color" value="f2f4ff" />
<span class="colorChangeButtonWrapper"><button id="bg-color-change" aria-label="Adjust Color" style="background-color: #f2f4ff;"><span aria-hidden="true"> </span></button></span>
<button aria-label="Swap colors" id="swap-colors" onclick="window.swapColors()"><span aria-hidden="true">⇅</span></button>
</div>
<label for="font-size">Font Size (px)</label>
<div>
<!-- font scale inspired from Refactoring UI book -->
<select id="font-size">
<option value="14">14</option>
<option value="16" selected>16</option>
<option value="18">18 - 22</option>
<option value="24">24 - 34</option>
<option value="36">36 - 46</option>
<option value="48">48 - 58</option>
<option value="60">60 - 70</option>
<option value="72">72+</option>
</select>
</div>
<label for="font-weight">Font Weight</label>
<div>
<input type="range" id="font-weight" step="100" min="100" max="900" value="400" oninput="this.nextElementSibling.value = this.value">
<output>400</output>
</div>
<label for="content-purpose" aria-describedby="content-purpose-desc">Content Type</label>
<div>
<select id="content-purpose">
<option value="sparseContent" selected>Sparse content</option>
<option value="denseTextOffset">Dense text</option>
<option value="byline">Byline</option>
<option value="nonText">Non-text</option>
</select>
<details id="content-purpose-desc">
<summary>Content types explanation</summary>
<ul style="padding-left: 15px;">
<li><em class="boldEm">Sparse content</em>: Upto two lines of text. e.g. a navigation menu item, including it's icon</li>
<li><em class="boldEm">Dense text</em>: large paragraphs of text</li>
<li><em class="boldEm">Byline</em>: e.g. copyright text on the footer of a website</li>
<li><em class="boldEm">Non-text</em>: e.g. a decorative border</li>
</ul>
</details>
</div>
<hr style="grid-column: 1/-1; width: 100%">
<span class="formGrid-leftHandNote">
Algorithm uses <a href="https://www.myndex.com/APCA">APCA silver lookup table</a>
</span>
<div>
<div id="error"></div>
<div id="preview-area">
<div id="preview-bg-color">
<div id="preview-text-color"></div>
</div>
<div id="preview-note"></div>
</div>
</div>
</div>
</div>
<!-- Floating picker -->
<dialog id="picker">
<div class="picker-header">
<h3>HSLuv Color Picker</h3>
<button id="picker-cancel-color" aria-label="Close" aria-hidden="true">×</button>
</div>
<div id="display">
<canvas style="position:absolute;left:0" height="400" width="400"></canvas>
<svg style="position:absolute;left:0" height="400" width="400"></svg>
</div>
<table>
<tr id="control-h">
<td class="cell-input">
<input type="number" min="0" max="360" step="any" class="counter counter-hue" tabindex="0"/>
</td>
<td><div class="range-slider"></div></td>
<td class="picker-label">H</td>
</tr>
<tr id="control-s">
<td class="cell-input">
<input type="number" step="any" min="0" max="100" class="counter counter-saturation"/>
</td>
<td><div class="range-slider"></div></td>
<td class="picker-label">S</td>
</tr>
<tr id="control-l">
<td class="cell-input">
<input type="number" step="any" min="0" max="100" class="counter counter-lightness"/>
</td>
<td><div class="range-slider"></div></td>
<td class="picker-label">L</td>
</tr>
<tr>
<td class="cell-input cell-input-hex">
<input class="input-hex" pattern="#?[0-9a-fA-F]{6}"/>
<br>
<output id="picker-lc"></output>
</td>
<td colspan="2"><div class="swatch"></div></td>
</tr>
</table>
<div class="picker-footer">
<button id="picker-save-color">Use Color</button>
</div>
</dialog>
<div class="backdrop"></div>
<!-- color picker init -->
<link rel="stylesheet" href="./picker.css" />
<script type="application/javascript" src="./picker.js"></script>
<script>
(() => {
let textColorPreviewEl = document.querySelector('#text-color-change'),
bgColorPreviewEl = document.querySelector('#bg-color-change'),
textColorInput = document.querySelector('#text-color'),
bgColorInput = document.querySelector('#bg-color');
textColorPreviewEl.onclick = window.createColorPickerOnClickHandler(document.querySelector('#text-color'), 'text-color', document.querySelector('#bg-color'));
bgColorPreviewEl.onclick = window.createColorPickerOnClickHandler(document.querySelector('#bg-color'), 'bg-color', document.querySelector('#text-color'));
function isValidHexColor(str) {
return /^#?[0-9a-f]{6}$/i.test((str || '').trim());
}
window.swapColors = function swapColors() {
var temp = textColorInput.value;
textColorInput.value = bgColorInput.value;
bgColorInput.value = temp;
// trigger a re-computation
textColorInput.dispatchEvent(new Event('input'));
}
})();
</script>
<a href="https://github.com/Munawwar/apca-color-contrast" class="github-corner" aria-label="View source on GitHub"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#64CEAA; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style>
</body>
</html>