Now let’s work on the radio buttons. We can animate the moment they are selected using transitions.
Here let’s use the :checked ~ device again, and let’s also assign transitions for the pseudo-elements.
First, let’s create the radio buttons and labels, then hide the radio buttons. Leave the labels. The label::before label pseudo-elements will be used as the circles for the radio buttons. The styles are already ready for them.
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The transition-duration property</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-duration-2">2. Transition duration, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-property">3. The transition-property: which properties can be changed smoothly?</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-delay">4. The transition-delay property</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-timing-function">5. The “form” of the transition, transition-timing-function</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-timing-function-2">6. transition-timing-function, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-timing-function-3">7. transition-timing-function, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transition-timing-function-4">8. transition-timing-function, step 4</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/paper-buttons">9. Paper buttons, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/paper-buttons-2">10. Paper buttons, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/paper-buttons-3">11. Paper buttons, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/checkboxes">12. Checkboxes, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/checkboxes-2">13. Checkboxes, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/checkboxes-3">14. Checkboxes, step 3</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/dynamic/smooth-transitions/radio-button">15. Radio buttons, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/radio-button-2">16. Radio buttons, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/radio-button-3">17. Radio buttons, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/toggle-switches">18. Toggle switches, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/toggle-switches-2">19. Toggle switches, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/toggle-switches-3">20. Toggle switches, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/toggle-switches-4">21. Toggle switches, step 4</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transformer-icon">22. The transformer icon, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transformer-icon-2">23. The transformer icon, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transformer-icon-3">24. The transformer icon, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/transformer-icon-4">25. The transformer icon, step 4</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/text-input-field">26. Text input field, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/text-input-field-2">27. Text input field, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/text-input-field-3">28. Text input field, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/smooth-transitions/text-input-field-4">29. Text input field, step 4</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/dynamic/smooth-transitions/radio-button-2">Radio buttons, step 2</a></div><ul class="main-nav__list main-nav__list--user main-nav__list--user-guest"><li class="main-nav__item" itemprop="name"><a class="main-nav__link" href="/signup?redirect_url=%2Fcourses%2Fdynamic%2Fsmooth-transitions%2Fradio-button" title="Sign up" data-modal="open" data-value="register" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg aria-hidden="true"><use xlink:href="/img/sprites/general.svg#user"></use></svg></span>Sign up</a></li><li class="main-nav__item main-nav__item--login" itemprop="name"><a class="main-nav__link" href="/login?redirect_url=%2Fcourses%2Fdynamic%2Fsmooth-transitions%2Fradio-button" title="Log in" data-modal="open" data-value="login" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg aria-hidden="true"><use 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fill="#EFA75B"/><path d="M31.963 50.968c-.197-.004-.358-.157-.372-.353-.018-.207.158-.378.364-.354 3.245-.26 3.505-2.156 3.608-2.25-.006-.19.183-.325.362-.26.193.01.35.16.363.354 0 .084 0 1.906 3.422 2 .192.008.348.16.362.353-.018.19-.172.34-.363.353-1.352.11-2.68-.4-3.61-1.386-.095-.096-.16-.22-.185-.353-.982 1.174-2.423 1.866-3.952 1.898z" fill="#151841"/><path d="M32.14 43.427c.186-.52 3.608.083 3.608.083s2.975-.688 3.422.084c-.05.288-.175.557-.363.78-.515-.056-1.037.004-1.525.178-.333.61-.488 1.304-.446 2-.222.394-.574.7-.995.864-.398-.112-.75-.354-.994-.688.047-.75-.146-1.496-.55-2.13-.27-.26-1.264.084-1.626-.083l-.53-1.088zm6.89.242c-.05.286-.175.556-.363.78-.503-.063-1.015-.012-1.497.148-.333.612-.487 1.305-.446 2-.222.394-.574.7-.995.864-.4-.112-.75-.354-.996-.688.053-.76-.14-1.515-.55-2.157-.268-.26-1.263.084-1.626-.084-.26-.23-.45-.53-.55-.864" fill="#CF4A27"/><path d="M35.748 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2.334.725-.13.837-1.46.93-2.13h.112c.937.492 1.647 1.33 1.98 2.334-.388.176-.793.31-1.21.4zm18.365-2.864c-1.104-.145-2.215-.232-3.33-.26-.546-.01-1.093.05-1.626.176-1.166.483-2.08 1.425-2.53 2.604l-.158.79 1.795.623c.558.153 1.132.24 1.71.26h.28c3.245-.177 4.137-3.72 4.137-3.72l.084-.353zm-1.264 1.86c-.54 1.394-2.882 1.646-2.966 1.646-.517-.02-1.03-.11-1.525-.26-.186-.085-.633-.26-1.08-.43.374-.966 1.117-1.746 2.065-2.165 0 .68.158 1.953.81 2.083.65.13.613-1.535.566-2.26.934.005 1.865.064 2.79.177-.11.316-.473.65-.66 1.17z" fill="#151841"/><path d="M19.26 39.27c.535 1.362 1.56 2.473 2.874 3.115.534.312 1.204-.07 1.207-.69.002-.285-.15-.55-.397-.695-.918-.46-1.65-1.222-2.073-2.158-.344-.957-1.972-.52-1.61.428zm29.45 3.125c1.083-.59 2.01-1.428 2.706-2.446.3-.556-.112-1.228-.743-1.21-.293.007-.56.17-.698.428-.568.776-1.306 1.412-2.158 1.86-.394.23-.517.742-.27 1.125.263.376.773.482 1.163.242z" fill="#EFA75B" stroke-width="13"/><path d="M16.025 32.436c1.525-1.386 2.427-4.408 2.79-6.835-.084.354 2.613.43 4.138-1.208 1.078-1.125.446-2-.186-3.375-1.71-3.552-4.585-6.323-7.384-8.918-.716-.69-1.44-2.428-2.706-2-.995.353-.93 3.2-.716 4.073 1.09 7.448 4.065 18.263 4.065 18.263zm37.372-.78c-1.704-1.826-2.822-4.12-3.208-6.585 0 .354-2.614.354-4.056-1.29-.995-1.127-.362-1.86.363-3.117 1.86-3.198 4.863-5.718 7.746-8.136.81-.604 1.627-1.47 2.79-.93.994.428.715 2.334.548 3.115-1.083 5.72-2.48 11.376-4.183 16.943z" fill="#FFF"/><path d="M53.564 20.422c-1.98.51-4.138 1.636-5.105 3.487-.43-2.196 1.645-4.65 3.393-5.832.333-.21.312-.703-.037-.886-.162-.085-.357-.076-.512.022-2.157 1.562-4.417 4.5-3.784 7.188.076.262.354.41.614.325l-.075.28c-.085.603.93.864.994.26.446-2.158 2.706-3.376 4.77-3.897.372-.076.522-.526.27-.81-.133-.15-.342-.204-.53-.138zM17.457 18.06c-.55-.354-.995.428-.55.865 1.433 1.004 3.182 3.05 3.395 4.956-.93-1.86-3.05-2.975-5.105-3.486-.386-.005-.633.41-.445.747.042.076.103.14.176.184 2.073.52 4.324 1.73 4.77 3.896.106.328.5.46.78.26.273.192.653.06.745-.26.735-2.66-1.6-5.728-3.766-7.16z" fill="#F1662A"/></svg></span><p class="course-loading-overlay__message"><b class="course-loading-overlay__message-title">Loading…</b><br><span class="course-loading-overlay__message-text">Everything will be ready in few seconds</span></p></div></div><div class="course-layout__sidebar course-theory"><div class="course-theory__inner course-theory__inner--left-stub"><button class="course-theory__close icon-close icon-close--light" type="button">Close</button><ul class="course-tabs course-tabs--non-interactive course-layout__theory-heading js--theory-tabs"><li class="course-tabs__item course-tabs__item--external course-tab course-tab--centered"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">Radio buttons, step 1</h1><div class="course-theory__content-text"><p>Now let’s work on the radio buttons. We can animate the moment they are selected using transitions.</p><p>Here let’s use the <code>:checked ~</code> device again, and let’s also assign transitions for the pseudo-elements.</p><p>First, let’s create the radio buttons and labels, then hide the radio buttons. Leave the labels. The <code>label::before</code> label pseudo-elements will be used as the circles for the radio buttons. The styles are already ready for them.</p></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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<html lang="en">
<head>
<title>Radio buttons, step 1</title>
<meta charset="utf-8">
<link rel="stylesheet" href="material.css">
<link rel="stylesheet" href="style.css">
</head>
<body class="yellow-theme">
<section class="card">
<h1 class="question"><span>What CSS property can you use to hide an element?</span></h1>
<form class="answers" action="https://echo.htmlacademy.ru/courses" method="post">
<button class="fab" type="submit">&#58882;</button>
<div>
<!--
<input type="radio" name="answer" id="answer1">
<label for="answer1"></label>
-->
</div>
<div>
<!--
<input type="radio" name="answer" id="answer2">
<label for="answer2"></label>
-->
</div>
<div>
<!--
<input type="radio" name="answer" id="answer3">
<label for="answer3"></label>
-->
</div>
</form>
</section>
</body>
</html>
</div></div><div class="js--editor course-editor course-layout__editor course-editor--hidden" id="" data-tab="css" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">CSS</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="css-editor">label {
position: relative;
cursor: pointer;
}
label::before,
label::after {
position: absolute;
top: 0;
left: -42px;
border-radius: 50%;
content: "";
}
label::before {
width: 12px;
height: 12px;
border: solid 2px #5a5a5a;
}
input[type="radio"] {
}
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</p></div></div><div class="course-browser__menu course-browser__menu--vertical"><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--increase" type="button" disabled title="Larger"><span class="course-browser__menu-item-inner">Larger</span></button><span class="course-browser__menu-item course-browser__zoom"><span class="course-browser__menu-item-inner">100%</span></span><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--decrease" type="button" title="Smaller"><span class="course-browser__menu-item-inner">Smaller</span></button></div><div class="js--validation-view course-browser__results-restriction course-browser__results-restriction--mini"><span class="tooltip tooltip--light tooltip--short course-browser__results-restriction-tooltip"><span class="js--tooltip-text"></span><button class="js--validation-view-close course-browser__results-restriction-tooltip-close icon-close" type="button">Закрыть</button></span></div></div><div class="course-goals js--goals"><div class="course-goals__heading"><span class="course-goals__heading-title"><span class="course-goals__count-label">Goals</span><span class="course-goals__count">completed</span></span><div class="js--annotations course-task-stats course-task-stats--disabled course-task-stats--centered "><span class="course-task-stats__indicator"><svg width="12" height="12" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M15 8C15 11.866 11.866 15 8 15C4.13403 15 1 11.866 1 8C1 4.13403 4.13403 1 8 1C11.866 1 15 4.13403 15 8ZM16 8C16 12.4183 12.4183 16 8 16C3.58173 16 0 12.4183 0 8C0 3.58173 3.58173 0 8 0C12.4183 0 16 3.58173 16 8ZM6.7287 3.88849C6.6958 3.59229 6.92761 3.33325 7.22565 3.33325H8.77502C9.07306 3.33325 9.30487 3.59229 9.27197 3.88849L8.71643 8.88849C8.68829 9.14166 8.47424 9.33325 8.21948 9.33325H7.78119C7.52643 9.33325 7.31238 9.14166 7.28424 8.88849L6.7287 3.88849ZM9.33368 12.0001C9.33368 12.7365 8.73669 13.3334 8.00031 13.3334C7.26392 13.3334 6.66699 12.7365 6.66699 12.0001C6.66699 11.2637 7.26392 10.6667 8.00031 10.6667C8.73669 10.6667 9.33368 11.2637 9.33368 12.0001Z" fill="currentColor"></path></svg><span class="js--annotations-counter course-task-stats__counter">0</span></span><div class="course-task-stats__scroller-wrapper"><div class="course-task-stats__scroller"><ul class="js--annotations-list course-task-stats__list"></ul></div></div></div><button class="course-goals__button course-goals__button--expand js--goals__expand" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-collapse"></use></svg></button><a class="course-goals__button course-goals__button--next button button--green button--without-border hidden" href="/courses/dynamic/smooth-transitions/radio-button-2" title="Radio buttons, step 2"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#arrow-white--mini"></use></svg></a></div><div class="course-goals__content"><ol class="course-goals__list"><li class="course-goals__list-item">Uncomment the radio buttons and labels.</li><li class="course-goals__list-item">Add the text <code>transparency</code> to the first label<span class="mark">,</span></li><li class="course-goals__list-item">add the text <code>opacity</code> to the second one<span class="mark">,</span></li><li class="course-goals__list-item">and finally append the text <code>invisibility</code> to the third one<span class="mark">.</span></li><li class="course-goals__list-item">Hide the radio buttons using <code>display: none</code><span class="mark">.</span></li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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