Interaction · Complete runnable example
Show the full lifecycle of a local action without pretending to call a server.
This preview runs in an isolated document. Clipboard writes and saved preferences may be blocked, and printing requires the standalone file. A dialog affects only the example. Reset reloads the original example state.
Use this example to study button feedback while a task is in progress. A 900ms local timer produces the explicitly selected outcome, allowing both success and error paths to be reviewed offline.
The preview, copied text, and downloaded file use this same document.
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<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta
http-equiv="Content-Security-Policy"
content="default-src 'none'; style-src 'unsafe-inline'; script-src 'unsafe-inline'; img-src data: blob:; connect-src 'none'; form-action 'none'; object-src 'none'; base-uri 'none'"
/>
<title>Every state has a place. | MRHTML example</title>
<style>
:root {
color-scheme: light;
--ink: #202b36;
--muted: #596675;
--line: #d5dde4;
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* {
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[hidden] {
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body {
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min-width: 0;
padding: 42px 22px;
background: #f2f4f7;
color: var(--ink);
line-height: 1.55;
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main {
max-width: 690px;
margin: auto;
}
.brand {
display: flex;
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gap: 10px;
margin: 0 0 25px;
color: var(--muted);
font-size: 12px;
letter-spacing: 0.04em;
}
.brand b {
color: var(--ink);
letter-spacing: -0.05em;
font-size: 17px;
}
.brand b span {
color: var(--blue);
}
.brand i {
flex: 1;
height: 1px;
background: var(--line);
}
.card {
background: var(--paper);
border: 1px solid var(--line);
border-radius: 18px;
padding: 32px;
box-shadow: 0 12px 36px #263a5110;
}
.eyebrow {
margin: 0 0 12px;
font-size: 11px;
font-weight: 700;
text-transform: uppercase;
letter-spacing: 0.12em;
color: var(--blue);
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h1 {
font-size: clamp(29px, 5vw, 38px);
line-height: 1.13;
letter-spacing: -0.04em;
margin: 0 0 14px;
}
h2 {
font-size: 20px;
line-height: 1.3;
margin: 0 0 14px;
}
p {
margin: 0 0 18px;
}
.intro {
color: var(--muted);
max-width: 55ch;
}
.hint,
.small {
font-size: 13px;
color: var(--muted);
}
.hint {
margin: 9px 0 0;
}
.footer {
font-size: 12px;
color: var(--muted);
margin: 20px 2px 0;
}
label,
legend {
font-weight: 700;
font-size: 14px;
}
label.field {
display: block;
margin: 18px 0 7px;
}
fieldset {
min-width: 0;
margin: 22px 0;
padding: 20px;
border: 1px solid var(--line);
border-radius: 10px;
}
legend {
padding: 0 7px;
}
input,
select,
textarea,
button {
font: inherit;
}
input:not([type='checkbox']):not([type='radio']),
select,
textarea {
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min-width: 0;
color: var(--ink);
background: #fff;
border: 1px solid #8896a5;
border-radius: 7px;
padding: 11px 12px;
font-size: 16px;
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input[type='checkbox'],
input[type='radio'] {
accent-color: var(--blue);
width: 18px;
height: 18px;
flex: none;
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textarea {
display: block;
resize: vertical;
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button {
border: 1px solid var(--blue);
border-radius: 7px;
min-height: 44px;
padding: 10px 17px;
background: var(--blue);
color: #fff;
font-size: 14px;
font-weight: 700;
cursor: pointer;
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button.secondary {
background: #fff;
color: var(--blue);
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button:disabled {
cursor: default;
opacity: 0.55;
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input:disabled,
select:disabled {
background: #f0f2f5;
color: #596675;
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:focus-visible {
outline: 3px solid #d46a20;
outline-offset: 3px;
}
.actions {
display: flex;
flex-wrap: wrap;
gap: 10px;
margin-top: 22px;
}
.status {
margin: 18px 0 0;
font-size: 14px;
min-height: 1.6em;
}
.error {
color: var(--danger);
}
.panel {
background: var(--pale);
padding: 20px;
border-radius: 10px;
margin-top: 24px;
}
.panel p:last-child {
margin-bottom: 0;
}
.row {
display: flex;
gap: 12px;
align-items: center;
}
.sr {
position: absolute;
width: 1px;
height: 1px;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
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noscript p {
border-left: 3px solid #9b6300;
background: #fff4d6;
padding: 12px;
font-size: 14px;
margin-top: 20px;
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code {
overflow-wrap: anywhere;
}
@media (max-width: 450px) {
body {
padding: 25px 14px;
}
.card {
padding: 23px 19px;
border-radius: 13px;
}
fieldset {
padding: 16px 13px;
}
.brand {
margin-bottom: 18px;
}
}
@media (prefers-reduced-motion: reduce) {
*,
*::before,
*::after {
animation: none !important;
transition: none !important;
scroll-behavior: auto !important;
}
}
.action-surface {
padding: 25px;
margin-top: 22px;
background: #202b36;
color: #fff;
border-radius: 10px;
}
#state-badge {
display: inline-block;
font: 11px monospace;
letter-spacing: 0.1em;
border: 1px solid #8192a2;
padding: 4px 7px;
border-radius: 4px;
}
.action-surface p {
margin: 15px 0 18px;
font-size: 21px;
}
.action-surface button {
background: #e4ebff;
color: #173ba9;
border-color: #e4ebff;
display: flex;
align-items: center;
gap: 9px;
}
.spinner {
width: 15px;
height: 15px;
border: 2px solid currentColor;
border-right-color: transparent;
border-radius: 50%;
animation: spin 1s linear infinite;
}
@keyframes spin {
to {
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<main>
<p class="brand">
<b>MR<span>HTML</span></b
><span>THE INTERACTION NOTEBOOK</span><i aria-hidden="true"></i>
</p>
<section class="card" aria-labelledby="title">
<p class="eyebrow">06 / Async action button</p>
<h1 id="title">Every state has a place.</h1>
<p class="intro">
A deterministic local simulation of a background action. Choose the
next result, then run the 900ms demo.
</p>
<label class="field" for="outcome">Next simulated outcome</label
><select id="outcome" disabled>
<option value="success">Success</option>
<option value="error">Error</option>
</select>
<div id="action-surface" class="action-surface" aria-busy="false">
<span id="state-badge">IDLE</span>
<p>Local sample check</p>
<button id="run-action" type="button" disabled>
<span class="spinner" aria-hidden="true" hidden></span
><span id="action-label">Run simulation</span>
</button>
</div>
<p id="action-status" class="status" role="status">
Ready when JavaScript is available. No network action occurs.
</p>
<p id="attempts" class="small">Completed local attempts: 0</p>
<div class="actions">
<button id="reset-action" type="button" class="secondary" disabled>
Reset demo
</button>
</div>
<noscript
><p>
The state preview remains readable. Running this local timer and
changing the state require JavaScript. No real task is started.
</p></noscript
>
</section>
<p class="footer">A local MRHTML example. Nothing is sent or saved.</p>
</main>
<script>
(function () {
'use strict';
var run = document.getElementById('run-action'),
reset = document.getElementById('reset-action'),
outcome = document.getElementById('outcome'),
surface = document.getElementById('action-surface'),
badge = document.getElementById('state-badge'),
label = document.getElementById('action-label'),
status = document.getElementById('action-status'),
spinner = document.querySelector('.spinner'),
attempts = document.getElementById('attempts');
var loading = false,
completed = 0;
run.addEventListener('click', function () {
if (loading) return;
loading = true;
var result = outcome.value;
run.disabled = true;
reset.disabled = true;
outcome.disabled = true;
surface.setAttribute('aria-busy', 'true');
badge.textContent = 'LOADING';
label.textContent = 'Running locally';
spinner.hidden = false;
status.textContent = 'Local simulation running. Please wait.';
window.setTimeout(function () {
loading = false;
completed++;
run.disabled = false;
reset.disabled = false;
outcome.disabled = false;
surface.setAttribute('aria-busy', 'false');
spinner.hidden = true;
attempts.textContent = 'Completed local attempts: ' + completed;
if (result === 'error') {
badge.textContent = 'ERROR';
label.textContent = 'Retry simulation';
status.textContent =
'Simulated error. No real operation failed. Choose an outcome and retry.';
} else {
badge.textContent = 'SUCCESS';
label.textContent = 'Run again';
status.textContent =
'Local simulation complete. Nothing was sent or saved.';
}
}, 900);
});
reset.addEventListener('click', function () {
if (loading) return;
completed = 0;
outcome.value = 'success';
badge.textContent = 'IDLE';
label.textContent = 'Run simulation';
attempts.textContent = 'Completed local attempts: 0';
status.textContent = 'Demo reset. No network action occurs.';
run.focus();
});
run.disabled = false;
reset.disabled = false;
outcome.disabled = false;
status.textContent =
'Ready. This is a local timer, not a network request.';
})();
</script>
</body>
</html>