Challenge - 5 Problems
HTML Mastery Badge
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Test your skills under time pressure!
❓ rendering
intermediate2:00remaining
What will this HTML page display?
Look at this HTML code. What text will you see on the page when opened in a browser?
HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>My Page</title> </head> <body> <h1>Welcome to my website</h1> <p>This is my first page.</p> </body> </html>
Attempts:
2 left
💡 Hint
Remember that text inside
and
tags inside the
shows on the page.✗ Incorrect
The shows in the browser tab, not on the page itself.</div></div></div></div><div class="challenge-container "><div class="task-card "><div class="task-header"><div class="task-badge"><span class="challenge-type-badge syntax">📝<!-- --> <!-- -->Syntax</span></div><span class="task-difficulty intermediate">intermediate</span></div><div class="challenge-timer "><svg class="timer-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><polyline points="12 6 12 12 16 14"></polyline></svg><span class="timer-value">2:00</span><span class="timer-label">remaining</span></div><div class="challenge-prompt"><div class="challenge-title">Which line fixes the missing closing tag error?</div><div>This HTML code is missing a closing tag. Which option correctly fixes it?</div></div><div class=""><div class="code-block"><div class="code-header"><span class="code-title">HTML</span><button class="code-copy-btn"><span class="new-material-symbols icon-hw-16"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M326.93-211.18q-30.99 0-53.37-22.38t-22.38-53.37v-528.56q0-31.06 22.38-53.48 22.38-22.43 53.37-22.43h408.56q31.06 0 53.48 22.43 22.43 22.42 22.43 53.48v528.56q0 30.99-22.43 53.37-22.42 22.38-53.48 22.38H326.93Zm0-75.75h408.56v-528.56H326.93v528.56ZM184.51-68.6q-31.06 0-53.48-22.43-22.43-22.42-22.43-53.48v-566.43q0-16 10.97-26.94 10.98-10.94 27.1-10.94 16.13 0 26.99 10.94 10.85 10.94 10.85 26.94v566.43h446.43q16 0 26.94 10.97 10.94 10.97 10.94 27.1 0 16.13-10.94 26.98-10.94 10.86-26.94 10.86H184.51Zm142.42-218.33v-528.56 528.56Z"></path></svg></span></button></div><pre class="code-content"><<span>!DOCTYPE</span> html>
<<span>html</span> <span>lang</span>=<span>"en"</span>>
<<span>head</span>>
<<span>meta</span> <span>charset</span>=<span>"UTF-8"</span>>
<<span>title</span>>Test</<span>title</span>>
</<span>head</span>>
<<span>body</span>>
<<span>h1</span>>Heading
<<span>p</span>>Paragraph text.</<span>p</span>>
</<span>body</span>>
</<span>html</span>></pre></div></div><div class="task-options"><div class="task-option "><span class="task-option-key">A</span><span class="text-pre-wrap"><h1>Heading<p></span></div><div class="task-option "><span class="task-option-key">B</span><span class="text-pre-wrap"><h1>Heading</h1></span></div><div class="task-option "><span class="task-option-key">C</span><span class="text-pre-wrap"><h1>Heading</h2></span></div><div class="task-option "><span class="task-option-key">D</span><span class="text-pre-wrap"><h1>Heading</body></span></div></div><div class="challenge-attempts"><span>Attempts:</span><div class="attempt-dots"><span class="attempt-dot "></span><span class="attempt-dot "></span></div><span>2<!-- --> left</span></div><div class="challenge-hint d-none"><div class="challenge-hint-title">💡 Hint</div><div class="challenge-hint-text">Every opening tag like <h1> needs a matching closing tag with the same name.</div></div><div class="feedback-box incorrect d-none"><div class="feedback-title">✗ Incorrect</div><div class="feedback-text">The <h1> tag must be closed with </h1>. Option B correctly closes it. Other options use wrong or missing closing tags causing errors.</div></div></div></div><div class="challenge-container "><div class="task-card "><div class="task-header"><div class="task-badge"><span class="challenge-type-badge selector">❓<!-- --> <!-- -->selector</span></div><span class="task-difficulty advanced">advanced</span></div><div class="challenge-timer "><svg class="timer-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><polyline points="12 6 12 12 16 14"></polyline></svg><span class="timer-value">2:00</span><span class="timer-label">remaining</span></div><div class="challenge-prompt"><div class="challenge-title">Which CSS selector targets only the main heading inside the body?</div><div>Given this HTML, which CSS selector will style only the <h1> inside <body>?</div></div><div class=""><div class="code-block"><div class="code-header"><span class="code-title">HTML</span><button class="code-copy-btn"><span class="new-material-symbols icon-hw-16"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M326.93-211.18q-30.99 0-53.37-22.38t-22.38-53.37v-528.56q0-31.06 22.38-53.48 22.38-22.43 53.37-22.43h408.56q31.06 0 53.48 22.43 22.43 22.42 22.43 53.48v528.56q0 30.99-22.43 53.37-22.42 22.38-53.48 22.38H326.93Zm0-75.75h408.56v-528.56H326.93v528.56ZM184.51-68.6q-31.06 0-53.48-22.43-22.43-22.42-22.43-53.48v-566.43q0-16 10.97-26.94 10.98-10.94 27.1-10.94 16.13 0 26.99 10.94 10.85 10.94 10.85 26.94v566.43h446.43q16 0 26.94 10.97 10.94 10.97 10.94 27.1 0 16.13-10.94 26.98-10.94 10.86-26.94 10.86H184.51Zm142.42-218.33v-528.56 528.56Z"></path></svg></span></button></div><pre class="code-content"><<span>!DOCTYPE</span> html>
<<span>html</span> <span>lang</span>=<span>"en"</span>>
<<span>head</span>>
<<span>style</span>>
/* Your CSS selector here */
</<span>style</span>>
</<span>head</span>>
<<span>body</span>>
<<span>h1</span>>Main Heading</<span>h1</span>>
<<span>section</span>>
<<span>h1</span>>Section Heading</<span>h1</span>>
</<span>section</span>>
</<span>body</span>>
</<span>html</span>></pre></div></div><div class="task-options"><div class="task-option "><span class="task-option-key">A</span><span class="text-pre-wrap">section h1</span></div><div class="task-option "><span class="task-option-key">B</span><span class="text-pre-wrap">h1</span></div><div class="task-option "><span class="task-option-key">C</span><span class="text-pre-wrap">body > h1</span></div><div class="task-option "><span class="task-option-key">D</span><span class="text-pre-wrap">body h1</span></div></div><div class="challenge-attempts"><span>Attempts:</span><div class="attempt-dots"><span class="attempt-dot "></span><span class="attempt-dot "></span></div><span>2<!-- --> left</span></div><div class="challenge-hint d-none"><div class="challenge-hint-title">💡 Hint</div><div class="challenge-hint-text">The > selector means direct child only.</div></div><div class="feedback-box incorrect d-none"><div class="feedback-title">✗ Incorrect</div><div class="feedback-text">Option C selects only <h1> elements that are direct children of <body>. The main heading is a direct child, but the section heading is nested inside <section>.</div></div></div></div><div class="challenge-container "><div class="task-card "><div class="task-header"><div class="task-badge"><span class="challenge-type-badge layout">❓<!-- --> <!-- -->layout</span></div><span class="task-difficulty advanced">advanced</span></div><div class="challenge-timer "><svg class="timer-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><polyline points="12 6 12 12 16 14"></polyline></svg><span class="timer-value">2:00</span><span class="timer-label">remaining</span></div><div class="challenge-prompt"><div class="challenge-title">How to center a div horizontally and vertically using Flexbox?</div><div>You want to center a <div> inside the body both horizontally and vertically. Which CSS code achieves this?</div></div><div class=""><div class="code-block"><div class="code-header"><span class="code-title">HTML</span><button class="code-copy-btn"><span class="new-material-symbols icon-hw-16"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M326.93-211.18q-30.99 0-53.37-22.38t-22.38-53.37v-528.56q0-31.06 22.38-53.48 22.38-22.43 53.37-22.43h408.56q31.06 0 53.48 22.43 22.43 22.42 22.43 53.48v528.56q0 30.99-22.43 53.37-22.42 22.38-53.48 22.38H326.93Zm0-75.75h408.56v-528.56H326.93v528.56ZM184.51-68.6q-31.06 0-53.48-22.43-22.43-22.42-22.43-53.48v-566.43q0-16 10.97-26.94 10.98-10.94 27.1-10.94 16.13 0 26.99 10.94 10.85 10.94 10.85 26.94v566.43h446.43q16 0 26.94 10.97 10.94 10.97 10.94 27.1 0 16.13-10.94 26.98-10.94 10.86-26.94 10.86H184.51Zm142.42-218.33v-528.56 528.56Z"></path></svg></span></button></div><pre class="code-content"><<span>!DOCTYPE</span> html>
<<span>html</span> <span>lang</span>=<span>"en"</span>>
<<span>head</span>>
<<span>style</span>>
body {
height: 100vh;
/* Your CSS here */
}
div {
width: 200px;
height: 100px;
background-color: lightblue;
}
</<span>style</span>>
</<span>head</span>>
<<span>body</span>>
<<span>div</span>>Centered Box</<span>div</span>>
</<span>body</span>>
</<span>html</span>></pre></div></div><div class="task-options"><div class="task-option "><span class="task-option-key">A</span><span class="text-pre-wrap">display: flex; justify-content: center; align-items: center;</span></div><div class="task-option "><span class="task-option-key">B</span><span class="text-pre-wrap">display: block; margin: auto;</span></div><div class="task-option "><span class="task-option-key">C</span><span class="text-pre-wrap">position: absolute; top: 50%; left: 50%;</span></div><div class="task-option "><span class="task-option-key">D</span><span class="text-pre-wrap">text-align: center; vertical-align: middle;</span></div></div><div class="challenge-attempts"><span>Attempts:</span><div class="attempt-dots"><span class="attempt-dot "></span><span class="attempt-dot "></span></div><span>2<!-- --> left</span></div><div class="challenge-hint d-none"><div class="challenge-hint-title">💡 Hint</div><div class="challenge-hint-text">Flexbox can align items both horizontally and vertically easily.</div></div><div class="feedback-box incorrect d-none"><div class="feedback-title">✗ Incorrect</div><div class="feedback-text">Option A uses flexbox on the body to center the div horizontally and vertically. Other options either only center horizontally or cause layout issues.</div></div></div></div><div class="challenge-container "><div class="task-card "><div class="task-header"><div class="task-badge"><span class="challenge-type-badge accessibility">❓<!-- --> <!-- -->accessibility</span></div><span class="task-difficulty expert">expert</span></div><div class="challenge-timer "><svg class="timer-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><polyline points="12 6 12 12 16 14"></polyline></svg><span class="timer-value">2:00</span><span class="timer-label">remaining</span></div><div class="challenge-prompt"><div class="challenge-title">Which attribute improves accessibility for a navigation menu?</div><div>You have a navigation menu in your HTML. Which attribute helps screen readers understand it is a navigation region?</div></div><div class=""><div class="code-block"><div class="code-header"><span class="code-title">HTML</span><button class="code-copy-btn"><span class="new-material-symbols icon-hw-16"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M326.93-211.18q-30.99 0-53.37-22.38t-22.38-53.37v-528.56q0-31.06 22.38-53.48 22.38-22.43 53.37-22.43h408.56q31.06 0 53.48 22.43 22.43 22.42 22.43 53.48v528.56q0 30.99-22.43 53.37-22.42 22.38-53.48 22.38H326.93Zm0-75.75h408.56v-528.56H326.93v528.56ZM184.51-68.6q-31.06 0-53.48-22.43-22.43-22.42-22.43-53.48v-566.43q0-16 10.97-26.94 10.98-10.94 27.1-10.94 16.13 0 26.99 10.94 10.85 10.94 10.85 26.94v566.43h446.43q16 0 26.94 10.97 10.94 10.97 10.94 27.1 0 16.13-10.94 26.98-10.94 10.86-26.94 10.86H184.51Zm142.42-218.33v-528.56 528.56Z"></path></svg></span></button></div><pre class="code-content"><<span>nav</span>>
<<span>ul</span>>
<<span>li</span>><<span>a</span> <span>href</span>=<span>"#home"</span>>Home</<span>a</span>></<span>li</span>>
<<span>li</span>><<span>a</span> <span>href</span>=<span>"#about"</span>>About</<span>a</span>></<span>li</span>>
</<span>ul</span>>
</<span>nav</span>></pre></div></div><div class="task-options"><div class="task-option "><span class="task-option-key">A</span><span class="text-pre-wrap">tabindex="-1"</span></div><div class="task-option "><span class="task-option-key">B</span><span class="text-pre-wrap">aria-hidden="true"</span></div><div class="task-option "><span class="task-option-key">C</span><span class="text-pre-wrap">alt="navigation menu"</span></div><div class="task-option "><span class="task-option-key">D</span><span class="text-pre-wrap">role="navigation"</span></div></div><div class="challenge-attempts"><span>Attempts:</span><div class="attempt-dots"><span class="attempt-dot "></span><span class="attempt-dot "></span></div><span>2<!-- --> left</span></div><div class="challenge-hint d-none"><div class="challenge-hint-title">💡 Hint</div><div class="challenge-hint-text">Roles describe the purpose of elements to assistive technologies.</div></div><div class="feedback-box incorrect d-none"><div class="feedback-title">✗ Incorrect</div><div class="feedback-text">Adding role="navigation" explicitly tells screen readers this is a navigation section. aria-hidden hides content from screen readers, tabindex affects keyboard focus, and alt is for images.</div></div></div></div></div></article><div class="confetti-container"></div></div></div></main><div style="position:fixed;bottom:24px;right:24px;z-index:50"><button style="background:rgba(255,255,255,0.95);border:1px solid rgba(108,99,255,0.18);border-radius:10px;padding:10px 16px;color:#5f56fe;font-size:14px;cursor:pointer;display:flex;align-items:center;gap:7px;backdrop-filter:blur(12px);box-shadow:0 2px 12px rgba(0,0,0,0.08), 0 0 0 1px rgba(108,99,255,0.06);transition:all 0.2s"><span style="font-size:14px">⚑</span>Report Issue</button></div></div> <script src="/_next/static/chunks/webpack-fd24bd8e19d2841a.js" 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