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HTML and CSS can create a page that looks dynamic through responsive layouts, hover effects, transitions, and animations. To make the page respond to clicks, validate input, or change content based on data, add JavaScript. Here’s a small working example and a practical path from files on your computer to a published page.
What “dynamic” means on a web page
“Dynamic” can describe visual motion or behavior that changes in response to a user or data. The distinction matters: CSS can animate appearance, but it does not replace JavaScript for event-driven logic such as responding to a button press or updating page content.
- HTML gives the page its structure and content: headings, paragraphs, lists, forms, and buttons.
- CSS controls presentation and layout, including responsive styling, visual states, transitions, and keyframe animations.
- JavaScript handles behavior: it can listen for events, check input, update content, and apply CSS classes that represent a new state.
The browser turns HTML into a document structure, applies CSS, and runs JavaScript. Scripts can modify the document, which can change what the browser renders.
Build a small interactive page
This example lets a visitor add a task, mark it complete, or remove it. HTML supplies the form and list, CSS styles the layout and completed state, and JavaScript handles the actions. Save the following three files in one folder and open index.html in a browser.
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#1 Best Overall
Elebase USB to USB C Adapter for iPhone 18 Pro Max,USBC Car Charger Adapter
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
1. Create index.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>My task list</title>
<link rel="stylesheet" href="styles.css">
<script src="script.js" defer></script>
</head>
<body>
<main class="panel">
<h1>My task list</h1>
<p>Add a task, then select it when it’s done.</p>
<form id="task-form">
<label for="task-input">New task</label>
<div class="form-row">
<input id="task-input" name="task" required maxlength="120">
<button type="submit">Add task</button>
</div>
</form>
<ul id="task-list" aria-label="Tasks"></ul>
<p id="empty-message">No tasks yet.</p>
</main>
</body>
</html>The defer attribute tells the browser to run the script after it has parsed the document, so the elements are available when the code attaches event listeners.
2. Add presentation in styles.css
* {
box-sizing: border-box;
}
body {
margin: 0;
padding: 2rem 1rem;
background: #f3f5f8;
color: #202633;
font: 1rem/1.5 system-ui, sans-serif;
}
.panel {
max-width: 36rem;
margin: 0 auto;
padding: 1.5rem;
background: white;
border-radius: 0.75rem;
box-shadow: 0 0.5rem 1.5rem rgb(20 35 55 / 10%);
}
.form-row {
display: flex;
gap: 0.5rem;
}
input, button {
min-height: 2.75rem;
font: inherit;
}
input {
flex: 1;
min-width: 0;
padding: 0.5rem;
border: 1px solid #8793a3;
border-radius: 0.35rem;
}
button {
padding: 0.5rem 0.85rem;
border: 0;
border-radius: 0.35rem;
background: #174ea6;
color: white;
cursor: pointer;
}
button:hover, button:focus-visible {
background: #103b80;
}
button:focus-visible, input:focus-visible {
outline: 3px solid #f0b429;
outline-offset: 2px;
}
#task-list {
padding: 0;
list-style: none;
}
.task {
display: flex;
align-items: center;
gap: 0.6rem;
padding: 0.65rem 0;
border-bottom: 1px solid #e1e5eb;
}
.task label {
flex: 1;
overflow-wrap: anywhere;
}
.task.is-complete label {
color: #657080;
text-decoration: line-through;
}
.remove-button {
background: #5b6470;
}
@media (max-width: 28rem) {
.form-row {
align-items: stretch;
flex-direction: column;
}
}
@media (prefers-reduced-motion: no-preference) {
.task {
transition: color 160ms ease, background-color 160ms ease;
}
}The media query adapts the form for narrow screens. The transition is limited to visual properties, and it is only enabled when the visitor has not requested reduced motion.
Rank #2
Anker USB-C Hub, 5-in-1 USB Hub for Laptops, 4K HDMI Multiport Adapter
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
3. Add behavior in script.js
const form = document.querySelector("#task-form");
const input = document.querySelector("#task-input");
const list = document.querySelector("#task-list");
const emptyMessage = document.querySelector("#empty-message");
function updateEmptyMessage() {
emptyMessage.hidden = list.children.length > 0;
}
form.addEventListener("submit", (event) => {
event.preventDefault();
const taskName = input.value.trim();
if (!taskName) {
input.focus();
return;
}
const item = document.createElement("li");
item.className = "task";
const checkbox = document.createElement("input");
checkbox.type = "checkbox";
checkbox.addEventListener("change", () => {
item.classList.toggle("is-complete", checkbox.checked);
});
const label = document.createElement("label");
label.textContent = taskName;
const removeButton = document.createElement("button");
removeButton.type = "button";
removeButton.className = "remove-button";
removeButton.textContent = "Remove";
removeButton.setAttribute("aria-label", `Remove task: ${taskName}`);
removeButton.addEventListener("click", () => {
item.remove();
updateEmptyMessage();
});
item.append(checkbox, label, removeButton);
list.append(item);
input.value = "";
input.focus();
updateEmptyMessage();
});
updateEmptyMessage();The form’s submit event is the behavior trigger. JavaScript reads the input, creates elements, and changes the page. It uses textContent for user-provided text rather than treating that text as HTML markup.
Choose CSS or JavaScript for the change
| What you want | Start with | Reason |
|---|---|---|
| A hover or focus appearance, or a gradual style change | CSS transition | Transitions interpolate supported property changes between states. |
| A repeating or sequenced decorative effect | CSS keyframes and animation | CSS can describe a motion sequence without JavaScript for basic animation. |
| Respond to a click, validate input, or update content from data | JavaScript with HTML and CSS | JavaScript supplies event and data logic; CSS styles the resulting state. |
| Create or control animation timing and playback at runtime | Web Animations API | JavaScript can construct browser animations and control their playback. |
| Transition between views or page documents | View Transition API, if supported | It can animate single-page state changes and multi-page navigation, but browser support should be checked before relying on it. |
CSS animation has limits: not every property can be animated, and transitions involving values such as auto may not behave consistently across browsers. Use JavaScript when a state or computed result—not just a visual effect—determines what should happen.
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Rank #3
Sale
Anker USB C Hub, 7in1 Multi-Port USB Adapter, 4K@60Hz USBC to HDMI Splitter
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Follow a beginner-friendly build and publish workflow
- Plan the page. Decide its purpose, audience, and content before choosing colors or effects.
- Write the HTML. Use meaningful elements for headings, content, forms, and controls.
- Style with CSS. Set typography, color, spacing, and responsive layout; test at narrow and wide viewport sizes.
- Pick one user task. Identify an action the visitor needs to complete, such as adding an item or submitting a form.
- Add JavaScript only for that behavior. Attach an event handler, validate or process the input, and update content or a CSS class.
- Add motion only where useful. Use transitions for state changes and keyframes for defined sequences. Use the Web Animations API when code needs to control playback or timing.
- Test and publish. Confirm the page works without animation, check keyboard interaction and reduced-motion behavior, then publish the finished files using a web host or static-site publishing service.
Make animation accessible and robust
- Do not make an essential instruction or status available only through motion.
- Respect
prefers-reduced-motionand provide a reduced-motion alternative where animation could be distracting or disorienting. - For motion that runs automatically and continues, consider whether visitors need a way to pause or disable it. Avoid flashing effects that may trigger problems for people with sensitivities.
- Check browser compatibility before depending on newer APIs such as View Transitions; support can vary and change over time.
- Make sure controls remain usable with a keyboard and that changes are understandable without relying on color alone.
Or skip the browser setup
If you need a screenshot of the page you built, ScreenshotNeo can return an image or PDF from one GET request. For example, this cURL request captures the published page as a WebP image:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpSee the ScreenshotNeo API documentation for request options. ScreenshotNeo removes cookie banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, and failed loads are not billed. Its MCP server lets AI agents take screenshots. The free plan includes 1,000 screenshots a month with no card, and paid plans start at $5 for 3,000. Learn more at ScreenshotNeo.
Sign up for 1,000 free screenshots a month—no card required.
Quick Recap
Bestseller No. 5
Best Value
Anker USB C Hub, 5-in-1 USBC to HDMI Splitter with 4K Display
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
Sale
UGREEN USB to USB C Adapter Combo 4-Pack, 10Gbps USB C Converter Space Gray
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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