This self-contained sidebar widget adds a cyberpunk-styled prompt field, a copy button, and a clear status message without a third-party runtime package. It is a front-end prompt helper—not an AI connection: it does not send text to a model or generate a response. The example uses native controls, keeps keyboard focus visible, and limits animation when reduced motion is requested.
What this widget does—and does not do
The widget gives visitors a compact place to draft a prompt and copy it for use elsewhere. Its styling uses CSS, and its interactions use browser JavaScript. “Zero-dependency” here means that the example requires no third-party runtime package; it still requires HTML, CSS, and JavaScript, and it relies on browser features such as the Clipboard API.
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There is no live AI integration in this source. Connecting a model would require a separate, deliberately designed service integration; do not put secret API credentials in browser code.
Full source code
Paste this markup where the sidebar widget should appear. The form uses a real label, textarea, and buttons, so visitors can use familiar browser keyboard behavior.
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<aside class="prompt-widget" aria-labelledby="prompt-widget-title">
<div class="prompt-widget__header">
<p class="prompt-widget__eyebrow">SIGNAL // 01</p>
<h2 id="prompt-widget-title">Prompt terminal</h2>
<p class="prompt-widget__intro">Draft a prompt, then copy it to use in your AI tool.</p>
</div>
<form class="prompt-widget__form" data-prompt-form>
<label for="prompt-widget-input">Your prompt</label>
<textarea
id="prompt-widget-input"
name="prompt"
rows="6"
placeholder="Describe what you want help with…"
required
></textarea>
<div class="prompt-widget__actions">
<button class="prompt-widget__button" type="submit">Copy prompt</button>
<button class="prompt-widget__button prompt-widget__button--secondary" type="reset">Clear</button>
</div>
<p class="prompt-widget__status" data-prompt-status role="status" aria-live="polite">Your text stays in this page until you copy it.</p>
</form>
</aside>
<style>
.prompt-widget {
--pw-bg: #10131b;
--pw-panel: #171d29;
--pw-text: #e9f0f7;
--pw-muted: #aab5c4;
--pw-cyan: #5fffe0;
--pw-pink: #ff4fd8;
box-sizing: border-box;
width: 100%;
padding: 1.25rem;
color: var(--pw-text);
background:
linear-gradient(135deg, rgb(95 255 224 / 8%), transparent 45%),
var(--pw-bg);
border: 1px solid rgb(95 255 224 / 45%);
border-radius: 0.75rem;
box-shadow: 0 0 1.5rem rgb(95 255 224 / 10%);
font: 400 1rem/1.5 system-ui, sans-serif;
}
.prompt-widget *,
.prompt-widget *::before,
.prompt-widget *::after {
box-sizing: inherit;
}
.prompt-widget__eyebrow {
margin: 0 0 0.35rem;
color: var(--pw-cyan);
font: 700 0.75rem/1.3 ui-monospace, monospace;
letter-spacing: 0.12em;
}
.prompt-widget h2 {
margin: 0;
font-size: 1.35rem;
line-height: 1.2;
}
.prompt-widget__intro {
margin: 0.55rem 0 1rem;
color: var(--pw-muted);
}
.prompt-widget__form label {
display: block;
margin-bottom: 0.4rem;
font-weight: 650;
}
.prompt-widget textarea {
display: block;
width: 100%;
min-height: 8rem;
padding: 0.75rem;
color: var(--pw-text);
background: var(--pw-panel);
border: 1px solid #465266;
border-radius: 0.45rem;
font: inherit;
resize: vertical;
}
.prompt-widget textarea::placeholder {
color: #b4bfce;
opacity: 1;
}
.prompt-widget__actions {
display: flex;
flex-wrap: wrap;
gap: 0.65rem;
margin-top: 0.8rem;
}
.prompt-widget__button {
min-height: 2.75rem;
padding: 0.55rem 0.9rem;
color: #071410;
background: var(--pw-cyan);
border: 1px solid var(--pw-cyan);
border-radius: 0.4rem;
font: 700 0.95rem/1.2 system-ui, sans-serif;
cursor: pointer;
}
.prompt-widget__button--secondary {
color: var(--pw-text);
background: transparent;
border-color: #718096;
}
.prompt-widget__button:hover {
border-color: var(--pw-pink);
box-shadow: 0 0 0.8rem rgb(255 79 216 / 30%);
}
.prompt-widget :focus-visible {
outline: 3px solid var(--pw-pink);
outline-offset: 3px;
}
.prompt-widget__status {
min-height: 1.5em;
margin: 0.75rem 0 0;
color: var(--pw-muted);
overflow-wrap: anywhere;
}
@media (prefers-reduced-motion: no-preference) {
.prompt-widget__button {
transition: box-shadow 160ms ease, border-color 160ms ease;
}
}
@media (prefers-reduced-motion: reduce) {
.prompt-widget__button {
transition: none;
}
}
</style>
<script>
(() => {
const form = document.querySelector('[data-prompt-form]');
if (!form) return;
const input = form.querySelector('textarea');
const status = form.querySelector('[data-prompt-status]');
form.addEventListener('submit', async (event) => {
event.preventDefault();
const prompt = input.value.trim();
if (!prompt) {
status.textContent = 'Enter a prompt before copying.';
input.focus();
return;
}
if (!navigator.clipboard || !window.isSecureContext) {
status.textContent = 'Copying is unavailable here. Select the text and copy it manually.';
input.focus();
return;
}
try {
await navigator.clipboard.writeText(prompt);
status.textContent = 'Prompt copied to clipboard.';
} catch {
status.textContent = 'Copy failed. Select the text and copy it manually.';
input.focus();
}
});
form.addEventListener('reset', () => {
status.textContent = 'Prompt cleared.';
});
})();
</script>The example uses an ordinary form submission handler rather than inline event-handler attributes. It writes the textarea value as text to the clipboard and never interprets visitor input as HTML.
Install it in a sidebar
- Choose the placement. Put the
<aside>where the sidebar content belongs. If your theme or CMS provides a custom HTML block, use that block for the markup. - Add the styles. For a quick prototype, keep the
<style>block alongside the markup. For a site deployment, moving the CSS into the theme stylesheet is often easier to reconcile with the site’s security policy. - Add the script. The inline script initializes the form after it appears in the document. If your platform blocks inline scripts, save the JavaScript in a separately served file and load it through the site’s approved script mechanism.
- Check the finished page. Test the actual sidebar at desktop and narrow widths, tab to every control, enter and clear text, and try copying on the deployed HTTPS page. Inspect the browser console if the widget does not initialize or copy.
Keyboard access and visible focus
The textarea and buttons are native interactive elements. A visitor can reach them with Tab, activate buttons with the keyboard, and use standard text-editing keys without custom keyboard code. MDN explains that native elements such as links, inputs, and selects already provide keyboard behavior, while custom widgets need explicit handling: Keyboard-navigable JavaScript widgets.
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The :focus-visible rule supplies a contrasting focus indicator instead of suppressing the browser outline globally. Test its contrast against your site’s colors and ensure theme rules do not remove it. The status message communicates success and errors in words, not color alone.
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The visual effect here is deliberately restrained: only a short button transition is used, and it is enabled under prefers-reduced-motion: no-preference. The reduced-motion rule removes that transition. W3C WAI documents both CSS and JavaScript techniques for responding to reduced-motion preferences; its CSS technique is an example rather than a requirement: C39: Using the CSS reduce motion feature and SCR40: Using the reduced motion feature to prevent motion.
Rank #3
If you add animated scan lines, pulsing glows, or JavaScript-driven effects, make those nonessential effects conditional on the same preference. Avoid adding motion that communicates information unavailable by other means.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Content Security Policy and deployment
“Zero-dependency” does not guarantee that a snippet can run unchanged on every site. A Content Security Policy (CSP) controls which resources a page may load, and relevant directives can block inline scripts, event-handler attributes, or inline styles. MDN describes CSP as a defense-in-depth control against threats including cross-site scripting and explains its effect on inline code: Content Security Policy (CSP).
Quick Recap
- Inline demo: The combined snippet is convenient where the host permits inline style and script blocks.
- Stricter policy: Move CSS and JavaScript to separately served files, or use the nonce or hash approach configured by the site administrator. Do not weaken the site’s policy broadly just to accommodate a widget.
- CMS or page builder: Some editors strip scripts or alter markup. Use the platform’s documented custom-code mechanism and verify the rendered page rather than assuming saved source is emitted unchanged.
Limitations to check before publishing
- The code selects the first matching prompt form in the document. If you place multiple copies on one page, give each instance unique IDs and initialize each form separately.
- Clipboard writing depends on browser support and a secure context; when unavailable or denied, the status message tells the visitor to copy manually.
- Whether inline code runs depends on the embedding site’s CSP and platform behavior. Test on the real page.
- The widget does not transmit, store, or process prompts through an AI service. Add any such capability as a separate feature with an appropriate privacy and security design.
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