7.0 KiB
7.0 KiB
| id | title | challengeType | dashedName |
|---|---|---|---|
| 614796cb8086be482d60e0ac | Step 45 | 0 | step-45 |
--description--
Sul tema dell'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.
Cambia il colore del testo di tutti gli elementi di ancoraggio dentro gli elementi della lista in qualcosa con un rapporto di contrasto di almeno 7:1.
--hints--
Dovresi usare il selettore li > a.
assert.exists(new __helpers.CSSHelp(document).getStyle('li > a'));
Dovresti dare all' elemento a un attributo color.
assert.notEmpty(new __helpers.CSSHelp(document).getStyle('li > a')?.color);
Dovresti dare alla proprietà color un contrasto con lo sfondo di almeno 7:1. Suggerimento: userei #dfdfe2
function luminance(r, g, b) {
const a = [r, g, b].map((v) => {
v /= 255;
return v <= 0.03928 ? v / 12.92 : Math.pow( (v + 0.055) / 1.055, 2.4 );
});
return a[0] * 0.2126 + a[1] * 0.7152 + a[2] * 0.0722;
}
function contrast(rgb1, rgb2) {
const lum1 = luminance(rgb1[0], rgb1[1], rgb1[2]);
const lum2 = luminance(rgb2[0], rgb2[1], rgb2[2]);
const brightest = Math.max(lum1, lum2);
const darkest = Math.min(lum1, lum2);
return (brightest + 0.05)
/ (darkest + 0.05);
}
const backgroundColour = [27, 27, 50];
for (let elem of document.querySelectorAll('li > a')) {
const a = getComputedStyle(elem)?.color;
const rgbA = a?.match(/(\d+),\s(\d+),\s(\d+)/);
const aColour = [rgbA[1], rgbA[2], rgbA[3]];
assert.isAtLeast(contrast(backgroundColour, aColour), 7);
}
--seed--
--seed-contents--
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="description" content="freeCodeCamp Accessibility Quiz practice project" />
<title>Accessibility Quiz</title>
<link rel="stylesheet" href="styles.css" />
</head>
<body>
<header>
<img id="logo" src="https://cdn.freecodecamp.org/platform/universal/fcc_primary.svg">
<h1>HTML/CSS Quiz</h1>
<nav>
<ul>
<li><a href="#student-info">INFO</a></li>
<li><a href="#html-questions">HTML</a></li>
<li><a href="#css-questions">CSS</a></li>
</ul>
</nav>
</header>
<main>
<form method="post" action="https://freecodecamp.org/practice-project/accessibility-quiz">
<section role="region" aria-labelledby="student-info">
<h2 id="student-info">Student Info</h2>
<div class="info">
<label for="student-name">Name:</label>
<input type="text" name="student-name" id="student-name" />
</div>
<div class="info">
<label for="student-email">Email:</label>
<input type="email" name="student-email" id="student-email" />
</div>
<div class="info">
<label for="birth-date">D.O.B.<span class="sr-only">(Date of Birth)</span></label>
<input type="date" name="birth-date" id="birth-date" />
</div>
</section>
<section role="region" aria-labelledby="html-questions">
<h2 id="html-questions">HTML</h2>
<div class="question-block">
<p>1</p>
<fieldset class="question" name="html-question-one">
<legend>
The legend element represents a caption for the content of its
parent fieldset element
</legend>
<ul class="answers-list">
<li>
<label for="q1-a1">
<input type="radio" id="q1-a1" name="q1" value="true" />
True
</label>
</li>
<li>
<label for="q1-a2">
<input type="radio" id="q1-a2" name="q1" value="false" />
False
</label>
</li>
</ul>
</fieldset>
</div>
<div class="question-block">
<p>2</p>
<fieldset class="question" name="html-question-two">
<legend>
A label element nesting an input element is required to have a
for attribute with the same value as the input's id
</legend>
<ul class="answers-list">
<li>
<label for="q2-a1">
<input type="radio" id="q2-a1" name="q2" value="true" />
True
</label>
</li>
<li>
<label for="q2-a2">
<input type="radio" id="q2-a2" name="q2" value="false" />
False
</label>
</li>
</ul>
</fieldset>
</div>
</section>
<section role="region" aria-labelledby="css-questions">
<h2 id="css-questions">CSS</h2>
<div class="formrow">
<div class="question-block">
<label for="customer">Are you a frontend developer?</label>
</div>
<div class="answer">
<select name="customer" id="customer" required>
<option value="">Select an option</option>
<option value="yes">Yes</option>
<option value="no">No</option>
</select>
</div>
<div class="question-block">
<label for="css-questions">Do you have any questions:</label>
</div>
<div class="answer">
<textarea id="css-questions" name="css-questions" rows="5" cols="24" placeholder="Who is flexbox..."></textarea>
</div>
</div>
</section>
<button type="submit">Submit</button>
</form>
</main>
<footer>
<address>
<a href="https://freecodecamp.org">freeCodeCamp</a><br />
San Francisco<br />
California<br />
USA
</address>
</footer>
</body>
</html>
body {
background: #f5f6f7;
color: #1b1b32;
font-family: Helvetica;
margin: 0;
}
header {
width: 100%;
height: 50px;
background-color: #1b1b32;
display: flex;
}
#logo {
width: max(100px, 18vw);
background-color: #0a0a23;
aspect-ratio: 35 / 4;
padding: 0.4rem;
}
h1 {
color: #f1be32;
font-size: min(5vw, 1.2em);
}
nav {
width: 50%;
max-width: 300px;
height: 50px;
}
nav > ul {
display: flex;
justify-content: space-evenly;
}
nav > ul > li {
color: #dfdfe2;
margin: 0 0.2rem;
padding: 0.2rem;
display: block;
}
--fcc-editable-region--
--fcc-editable-region--
h1,
h2 {
font-family: Verdana, Tahoma;
}
h2 {
border-bottom: 4px solid #dfdfe2;
}
p::before {
content: "Question #";
}
.sr-only {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border: 0;
}