For a small formatting feature, start with a constrained contenteditable='true' surface, observe the browser’s input and selection events, and convert the resulting DOM into your own normalized document before saving. Use plaintext-only when formatting is unnecessary. For tables, mentions, collaboration, comments, or a large plugin set, evaluate a maintained editor framework. Choose EditContext only when you need custom rendering and precise control of IME composition and selection. Do not make new architecture depend on deprecated document.execCommand().
Choose the editing model before writing UI code
An HTML editor has two separate jobs: accepting text input and representing a document. The browser can provide the first job, but its DOM is not a stable document model. Decide what your application will store before choosing controls.
| Approach | Use it when | Costs and risks |
|---|---|---|
contenteditable with custom handlers |
A small, well-defined set of paragraphs, marks, links, or lists is enough. | You must own browser-markup normalization, paste handling, selection edge cases, undo behavior, and accessibility. |
| Maintained editor framework or component | You need tables, mentions, comments, collaboration, rich history, or many plugins. | Evaluate dependency size, schema migrations, licensing, and integration work. |
| EditContext with a custom renderer | You need custom drawing or layout plus advanced IME, emoji, or platform text-input behavior. | Your application owns document state, rendering, selection mapping, selection bounds, keyboard behavior, and edit handling. |
contenteditable is an editing primitive, not a complete document model. Keep the editable surface deliberately narrow: define the blocks and inline marks you support, then reject everything else.
Define a document contract
Write down the allowed structure before implementing toolbar buttons. A simple contract might allow paragraphs, headings, unordered lists, links, and bold or italic marks. Store either this normalized representation or sanitized HTML; never treat arbitrary browser-generated DOM as trusted data.
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{
'version': 1,
'blocks': [
{ 'type': 'paragraph', 'children': [
{ 'text': 'Release notes', 'marks': ['bold'] }
]},
{ 'type': 'paragraph', 'children': [
{ 'text': 'Read the ', 'marks': [] },
{ 'text': 'documentation', 'marks': [], 'href': 'https://example.com/docs' }
]}
]
}Version the format. A future migration can then transform version 1 documents instead of guessing what an old HTML fragment meant. Validate the same contract on the server and render it with the same allowlist.
Build a constrained contenteditable surface
The following example supports paragraphs, plain-text paste, bold and italic marks, and a normalized HTML snapshot. It intentionally avoids execCommand. The mark function is suitable for a small demo where the selection is inside one text node; a production editor should apply marks through its document model so selections spanning several nodes behave consistently.
<label for='editor'>Article body</label>
<div class='toolbar' role='toolbar' aria-label='Formatting'>
<button type='button' data-mark='bold' aria-label='Bold'>Bold</button>
<button type='button' data-mark='italic' aria-label='Italic'>Italic</button>
</div>
<div id='editor' contenteditable='true' role='textbox' aria-multiline='true'
aria-labelledby='editor' spellcheck='true'><p><br></p></div>
<output id='status' aria-live='polite'></output>
<script>
const editor = document.querySelector('#editor');
const status = document.querySelector('#status');
let composing = false;
function allowedUrl(value) {
try {
const url = new URL(value, window.location.href);
return ['http:', 'https:'].includes(url.protocol) ? url.href : null;
} catch {
return null;
}
}
function normalize(root) {
// Convert browser-specific line breaks into paragraphs and remove
// elements and attributes outside the application contract.
root.querySelectorAll('script,style,iframe,object,embed,form').forEach(node => node.remove());
root.querySelectorAll('*').forEach(node => {
[...node.attributes].forEach(attribute => {
if (!['href','title'].includes(attribute.name)) node.removeAttribute(attribute.name);
});
if (node.matches('a')) {
const safe = allowedUrl(node.getAttribute('href') || '');
if (safe) node.setAttribute('href', safe);
else node.replaceWith(...node.childNodes);
}
});
root.querySelectorAll('div').forEach(div => {
const paragraph = document.createElement('p');
paragraph.innerHTML = div.innerHTML;
div.replaceWith(paragraph);
});
return root.innerHTML;
}
function saveDraft() {
const copy = editor.cloneNode(true);
const html = normalize(copy);
// Send html to your server, where the same allowlist is enforced.
status.textContent = 'Draft changed';
return html;
}
editor.addEventListener('beforeinput', event => {
// Use this event for model operations such as inserting paragraphs,
// deleting ranges, or applying marks. Do not cancel ordinary text input
// unless your model is ready to perform the replacement.
if (event.inputType === 'formatBold' || event.inputType === 'formatItalic') {
event.preventDefault();
}
});
editor.addEventListener('compositionstart', () => { composing = true; });
editor.addEventListener('compositionend', () => { composing = false; saveDraft(); });
editor.addEventListener('input', () => { if (!composing) saveDraft(); });
editor.addEventListener('paste', event => {
event.preventDefault();
const text = event.clipboardData.getData('text/plain');
const selection = window.getSelection();
if (!selection.rangeCount) return;
const range = selection.getRangeAt(0);
range.deleteContents();
const fragment = document.createDocumentFragment();
text.split(/r?n/).forEach((line, index, lines) => {
fragment.append(document.createTextNode(line));
if (index < lines.length - 1) fragment.append(document.createElement('br'));
});
range.insertNode(fragment);
selection.collapseToEnd();
saveDraft();
});
document.querySelectorAll('[data-mark]').forEach(button => {
button.addEventListener('mousedown', event => event.preventDefault());
button.addEventListener('click', () => {
const selection = window.getSelection();
if (!selection.rangeCount || selection.isCollapsed) return;
const range = selection.getRangeAt(0);
if (!editor.contains(range.commonAncestorContainer)) return;
const tag = button.dataset.mark === 'bold' ? 'strong' : 'em';
const wrapper = document.createElement(tag);
try {
range.surroundContents(wrapper);
selection.removeAllRanges();
const next = document.createRange();
next.selectNodeContents(wrapper);
selection.addRange(next);
saveDraft();
} catch {
status.textContent = 'Select text within one paragraph to format it';
}
});
});
</script>Give the surface a visible focus style and keep the label visible. The role='textbox' and aria-multiline='true' communicate its purpose to assistive technology; test with the screen readers and keyboard layouts your users rely on.
Handle input, selection, IME, and undo
Observe the right events
Use beforeinput when you need to translate an edit into a document operation, and input to observe the resulting change. Track selectionchange to keep toolbar state, link dialogs, and formatting indicators synchronized with the current selection. Do not assume that a keydown event describes the edit; virtual keyboards and assistive technology often do not produce the same key sequence.
Protect composition text
IME input is provisional: Japanese, Chinese, Korean, and other input methods compose text through multiple updates. Treat compositionstart through compositionend as one transaction. Avoid normalizing or rerendering the active text node during composition, or the caret can jump and the candidate window can break. Commit the final text after compositionend.
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Preserve undo semantics
Users expect one undo step to reverse one logical action. If you replace the DOM after every keystroke, you can destroy the browser’s native history. Keep the editing surface stable, group programmatic changes deliberately, and maintain a model-level history when your application performs its own transformations. Test undo and redo after typing, paste, formatting, link insertion, and an IME commit.
Map selections safely
A DOM range can point into text nodes that your normalizer later merges or replaces. Before rerendering, capture a model position or a stable marker, then restore the selection after the update. Never trust a selection supplied by the client when applying a server-side operation.
Implement paste and clipboard behavior deliberately
Paste from word processors and web pages can contain nested spans, inline styles, tracking links, images, and event-handler attributes. Prefer plain text for a note field. For rich paste, parse the HTML, keep only your allowlisted tags and attributes, normalize lists and line breaks, and resolve links through a protocol allowlist. The Clipboard API is the preferred modern interface for clipboard operations; do not build new copy and paste flows around execCommand('copy').
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Decide what happens to images before enabling them. You can remove them, convert them to approved uploads, or store references to an object-storage service. Never accept a pasted data URL or remote image URL without applying size, type, origin, and malware controls.
Normalize and sanitize at the trust boundary
Browser markup differs across engines. Enter may create a block element in one browser and a line break in another, and equivalent selections can produce different nesting. Normalize after input and again before persistence. A safe pipeline is:
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- Parse the fragment in an inert document.
- Drop disallowed elements, attributes, CSS, and event-handler content.
- Convert equivalent structures to your canonical blocks and marks.
- Validate URLs, uploaded files, and document size.
- Store the versioned result and render it with the same allowlist.
Client-side cleaning improves the editing experience but is not a security boundary. A user can bypass your JavaScript and submit an HTTP request directly, so server-side validation is mandatory. Escape text when rendering into a non-editor context, and use a well-maintained sanitizer rather than a regular-expression filter.
When EditContext is the better foundation
EditContext is intended for custom rich-text editors that need advanced text-input experiences such as IME composition, emoji pickers, or other platform-specific editing UI. With it, your application owns text state, rendering, selection mapping, selection bounds, and edit handling. That control is useful for a canvas-like renderer, a virtualized document, or a layout that cannot be represented by ordinary editable DOM.
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The trade-off is substantial: you must implement caret painting, hit testing, keyboard navigation, deletion rules, bidirectional text behavior, accessibility exposure, and model synchronization. Treat EditContext as an explicit investment, not a drop-in replacement for contenteditable, and verify availability in every browser and WebView you support before committing to it.
Accessibility and mobile requirements
- Provide a persistent accessible name and a visible focus indicator.
- Keep toolbar controls reachable by keyboard and expose pressed state for toggles.
- Do not use placeholder text as the only label.
- Test arrow-key navigation, Home and End, selection extension, and deletion with a screen reader running.
- Check mobile keyboards, rotation, zoom, autocorrect, spellcheck, and long-press selection.
- Ensure dialogs for links or embeds return focus to the editor and preserve the selection.
Testing checklist before shipping
- Type, delete, select across marks, and undo or redo every command.
- Compose text with at least one IME and insert emoji.
- Paste plain text, rich web content, and a document copied from a word processor.
- Press Enter at the start, middle, and end of paragraphs in every supported browser.
- Paste malformed HTML, dangerous URLs, SVG, data URLs, and oversized content.
- Navigate the complete editor with keyboard-only and screen-reader controls.
- Open an old document after a schema migration and verify that it renders identically.
- Throttle the network, interrupt autosave, reload during a save, and recover without losing the latest acknowledged draft.
Troubleshoot common failures
| Symptom | Likely cause | Fix |
|---|---|---|
| Enter creates inconsistent spacing or tags | Browser-specific block and break behavior is being saved directly. | Convert blocks to your canonical paragraph model before persistence. |
| Caret jumps while typing an accented or East Asian language | The DOM is being rerendered during composition. | Defer normalization until compositionend and restore a model selection. |
| Undo removes several unrelated edits | Programmatic DOM replacement collapsed the browser history. | Keep nodes stable, group intentional transactions, or use model-level history. |
| Pasted content contains scripts or tracking links | Raw clipboard HTML was inserted or only cleaned in the browser. | Parse through an allowlist and repeat validation on the server. |
| Formatting fails for a multi-node selection | Range.surroundContents() cannot wrap partially selected elements. |
Apply a mark operation to model ranges, splitting text nodes as needed. |
| Toolbar clicks lose the selection | Focus moved before the command read the range. | Record the selection, prevent toolbar mousedown from stealing focus, then restore it. |
| Saved HTML renders differently from the editor | Rendering and editing use different sanitizers or schemas. | Share one versioned contract and allowlist at both boundaries. |
Performance, reliability, and operating cost
Keep the live DOM limited to the visible editing surface; very large documents may need pagination or virtualization, which is easier with a model-driven framework. Debounce autosave, but show whether a change is unsaved and retain the last acknowledged revision. Send small operations or compressed document snapshots rather than repeatedly uploading identical HTML. Add request identifiers so a delayed response cannot overwrite a newer draft.
Measure the behaviors that affect users—input latency, composition stability, paste time, document size, and recovery after a failed save—on the devices and browsers you support. There is no single browser-support percentage or performance number that substitutes for those tests.
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FAQ
Should every editor store HTML?
No. A versioned document model is easier to validate, migrate, and render consistently. Store sanitized HTML only when its structure is your deliberate contract.
Can I keep using execCommand in an old editor?
It may maintain legacy behavior, but the API is deprecated. Avoid adding new architecture around it and plan a migration toward input events, model operations, and the Clipboard API.
When is plaintext-only the right choice?
Use contenteditable='plaintext-only' for notes, titles, or other fields where raw text is required and rich formatting would add risk without value.
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Do I need a framework for a two-button editor?
Not necessarily. A constrained surface can be appropriate when your team is prepared to own normalization, paste, selection, undo, accessibility, and server-side sanitization. Reconsider when those requirements expand.
Frequently Asked Questions
How do I prevent an editor from saving unsafe markup?
Define an allowlist, normalize pasted and browser-generated DOM into it, and validate again on the server before storing or rendering.
Why does IME support require special handling?
IME text is composed through provisional updates; rerendering during composition can move the caret or disrupt the candidate window, so commit after compositionend.
What is the main reason to choose EditContext?
It gives a custom renderer control over text state, selection, bounds, and input behavior when contenteditable cannot provide the required layout or IME experience.
Quick Recap
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