261 lines
7.0 KiB
Markdown
261 lines
7.0 KiB
Markdown
---
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id: 614796cb8086be482d60e0ac
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title: Step 46
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challengeType: 0
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dashedName: step-46
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---
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# --description--
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Per quanto riguarda l'accessibilità visiva, il contrasto tra gli elementi è un fattore chiave. Ad esempio, il contrasto tra il testo e lo sfondo di un titolo dovrebbe essere almeno 4.5:1.
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Cambia il colore del testo di tutti gli elementi di ancoraggio dentro gli elementi della lista in modo che abbia un rapporto di contrasto di almeno 7:1.
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# --hints--
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Dovresti usare il selettore `li > a`.
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```js
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assert.exists(new __helpers.CSSHelp(document).getStyle('li > a'));
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```
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Dovresti dare all'elemento `a` una proprietà `color`.
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```js
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assert.notEmpty(new __helpers.CSSHelp(document).getStyle('li > a')?.color);
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```
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Dovresti dare alla proprietà `color` un contrasto con lo sfondo di almeno 7:1. _Suggerimento: userei `#dfdfe2`_
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```js
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function luminance(r, g, b) {
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const a = [r, g, b].map((v) => {
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v /= 255;
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return v <= 0.03928 ? v / 12.92 : Math.pow( (v + 0.055) / 1.055, 2.4 );
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});
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return a[0] * 0.2126 + a[1] * 0.7152 + a[2] * 0.0722;
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}
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function contrast(rgb1, rgb2) {
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const lum1 = luminance(rgb1[0], rgb1[1], rgb1[2]);
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const lum2 = luminance(rgb2[0], rgb2[1], rgb2[2]);
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const brightest = Math.max(lum1, lum2);
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const darkest = Math.min(lum1, lum2);
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return (brightest + 0.05)
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/ (darkest + 0.05);
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}
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const backgroundColour = [27, 27, 50];
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for (let elem of document.querySelectorAll('li > a')) {
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const a = getComputedStyle(elem)?.color;
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const rgbA = a?.match(/(\d+),\s(\d+),\s(\d+)/);
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const aColour = [rgbA[1], rgbA[2], rgbA[3]];
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assert.isAtLeast(contrast(backgroundColour, aColour), 7);
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}
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```
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# --seed--
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## --seed-contents--
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```html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta name="description" content="freeCodeCamp Accessibility Quiz practice project" />
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<title>Accessibility Quiz</title>
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<link rel="stylesheet" href="styles.css" />
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</head>
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<body>
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<header>
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<img id="logo" src="https://cdn.freecodecamp.org/platform/universal/fcc_primary.svg">
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<h1>HTML/CSS Quiz</h1>
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<nav>
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<ul>
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<li><a href="#student-info">INFO</a></li>
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<li><a href="#html-questions">HTML</a></li>
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<li><a href="#css-questions">CSS</a></li>
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</ul>
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</nav>
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</header>
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<main>
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<form method="post" action="https://freecodecamp.org/practice-project/accessibility-quiz">
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<section role="region" aria-labelledby="student-info">
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<h2 id="student-info">Student Info</h2>
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<div class="info">
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<label for="student-name">Name:</label>
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<input type="text" name="student-name" id="student-name" />
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</div>
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<div class="info">
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<label for="student-email">Email:</label>
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<input type="email" name="student-email" id="student-email" />
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</div>
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<div class="info">
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<label for="birth-date">D.O.B.<span class="sr-only">(Date of Birth)</span></label>
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<input type="date" name="birth-date" id="birth-date" />
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</div>
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</section>
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<section role="region" aria-labelledby="html-questions">
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<h2 id="html-questions">HTML</h2>
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<div class="question-block">
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<p>1</p>
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<fieldset class="question" name="html-question-one">
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<legend>
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The legend element represents a caption for the content of its
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parent fieldset element
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</legend>
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<ul class="answers-list">
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<li>
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<label for="q1-a1">
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<input type="radio" id="q1-a1" name="q1" value="true" />
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True
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</label>
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</li>
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<li>
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<label for="q1-a2">
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<input type="radio" id="q1-a2" name="q1" value="false" />
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False
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</label>
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</li>
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</ul>
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</fieldset>
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</div>
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<div class="question-block">
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<p>2</p>
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<fieldset class="question" name="html-question-two">
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<legend>
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A label element nesting an input element is required to have a
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for attribute with the same value as the input's id
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</legend>
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<ul class="answers-list">
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<li>
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<label for="q2-a1">
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<input type="radio" id="q2-a1" name="q2" value="true" />
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True
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</label>
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</li>
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<li>
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<label for="q2-a2">
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<input type="radio" id="q2-a2" name="q2" value="false" />
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False
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</label>
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</li>
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</ul>
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</fieldset>
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</div>
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</section>
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<section role="region" aria-labelledby="css-questions">
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<h2 id="css-questions">CSS</h2>
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<div class="formrow">
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<div class="question-block">
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<label for="customer">Are you a frontend developer?</label>
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</div>
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<div class="answer">
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<select name="customer" id="customer" required>
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<option value="">Select an option</option>
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<option value="yes">Yes</option>
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<option value="no">No</option>
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</select>
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</div>
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<div class="question-block">
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<label for="css-questions">Do you have any questions:</label>
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</div>
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<div class="answer">
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<textarea id="css-questions" name="css-questions" rows="5" cols="24" placeholder="Who is flexbox..."></textarea>
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</div>
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</div>
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</section>
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<button type="submit">Submit</button>
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</form>
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</main>
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<footer>
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<address>
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<a href="https://freecodecamp.org">freeCodeCamp</a><br />
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San Francisco<br />
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California<br />
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USA
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</address>
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</footer>
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</body>
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</html>
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```
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```css
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body {
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background: #f5f6f7;
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color: #1b1b32;
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font-family: Helvetica;
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margin: 0;
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}
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header {
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width: 100%;
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height: 50px;
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background-color: #1b1b32;
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display: flex;
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}
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#logo {
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width: max(100px, 18vw);
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background-color: #0a0a23;
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aspect-ratio: 35 / 4;
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padding: 0.4rem;
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}
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h1 {
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color: #f1be32;
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font-size: min(5vw, 1.2em);
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}
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nav {
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width: 50%;
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max-width: 300px;
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height: 50px;
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}
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nav > ul {
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display: flex;
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justify-content: space-evenly;
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}
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nav > ul > li {
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color: #dfdfe2;
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margin: 0 0.2rem;
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padding: 0.2rem;
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display: block;
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}
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--fcc-editable-region--
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--fcc-editable-region--
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h1,
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h2 {
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font-family: Verdana, Tahoma;
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}
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h2 {
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border-bottom: 4px solid #dfdfe2;
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}
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p::before {
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content: "Question #";
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}
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.sr-only {
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position: absolute;
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width: 1px;
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height: 1px;
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padding: 0;
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margin: -1px;
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overflow: hidden;
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clip: rect(0, 0, 0, 0);
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white-space: nowrap;
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border: 0;
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}
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```
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