Advanced text layers are document objects, not painted pixels. A reliable browser editor stores text content, geometry, typography, and interaction state separately from its current rendering. In a DOM editor, the browser can provide selection, keyboard, and accessibility behavior directly. In a canvas editor, a practical pattern is to render a selectable text node on canvas and temporarily place a native input or textarea over it during editing. This separation makes resizing, web-font loading, undo, export, and per-range formatting manageable.
What an advanced text layer contains
Model a text layer as structured data rather than a bitmap. At minimum, keep these concerns distinct:
- Content: the string, line breaks, and (when needed) rich-text ranges.
- Geometry: position, rotation, width, height, and the rule that determines how those dimensions change.
- Typography: family, weight, size, line height, letter spacing, paragraph spacing, indentation, case, decoration, lists, and OpenType features.
- Appearance: fill or color, opacity, blend behavior, and any editor-specific effects.
- Interaction: selection, focus, caret, hit testing, keyboard commands, links, and accessibility metadata.
Konva describes its text node as a movable, stylable, measurable, and hit-testable shape. That is a useful mental model even if your editor does not use Konva: the layer must remain a live object that can be measured and manipulated after every edit.
Choose the editing surface: DOM, canvas, or a hybrid
DOM-first text
A DOM element such as a content-editable region gives you native selection, keyboard navigation, IME composition, copy and paste, and screen-reader semantics. It is usually the shortest route when text is the primary product rather than one object in a visual composition. You still need a document model to preserve styles, transforms, and export behavior; the DOM should not be your only source of truth.
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Canvas-first rendering
Canvas is effective for a scene containing many selectable objects, transforms, and pixel-accurate export. However, the Canvas API is not designed for text editing, as Konva’s documentation states. A canvas drawing has no native caret, selection range, or input method behavior. Attempting to recreate all of those details is a large accessibility and internationalization project.
The hybrid pattern
Keep a canvas text object for display, movement, hit testing, and transforms. On double-click, Enter, or an explicit edit command, create a positioned native textarea (or input for single-line text) above the canvas. Copy the layer’s font and geometry into that control, focus it, and synchronize changes into the document model. On blur or an explicit commit, remove the control, remeasure the text, and redraw the canvas node.
- Hit-test the canvas node and record its transform and bounding box.
- Place the editing control in the same screen coordinates, accounting for canvas scale and device-pixel ratio.
- Apply the exact font family, weight, size, line height, letter spacing, padding, and text direction.
- Mirror content and selection changes into your model; handle composition events before committing.
- On commit, update the model, recalculate wrapping and height, then redraw and restore selection state.
This is an implementation pattern suggested by Konva’s guidance, not a claim that every commercial editor uses it.
Define text-box sizing before writing UI code
Users need predictable answers to a basic question: what happens when text is inserted, deleted, or resized? Figma documents two common creation interactions:
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| Click and drag | Fixed-size area; text wraps and can overflow | Paragraphs and copy blocks |
Implement these as explicit modes in your model. For auto-width, measure each edit and set the box width to the rendered advance, subject to a maximum if your product needs one. For fixed-size text, preserve width, wrap at that width, and decide whether height grows, clips, or exposes overflow. Resizing a box should not silently change font size unless your product clearly labels that behavior as a separate scale operation.
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Overflow and minimum dimensions
- Show an overflow indicator when content exceeds the fixed box instead of silently losing text.
- Keep a minimum width and height so a selected layer remains discoverable.
- When rotating or scaling, distinguish geometric scale from typographic size; users may expect one or the other.
- Store dimensions in document coordinates, not CSS pixels, so zooming the editor does not alter content.
Build a typography system, not a bag of CSS declarations
Reusable text styles let a team maintain a coherent type system. Figma’s documented text-style properties include typeface, weight and size, line height, letter spacing, paragraph spacing and indentation, decoration, letter case, lists, and OpenType features. Its list does not include horizontal or vertical alignment, fill or color, or resizing behavior. Keep those boundaries explicit in your schema.
Separate style tokens from layer properties
A useful model stores a textStyleId plus local overrides. Alignment, color, and box behavior can remain layer properties when your style system does not govern them. Applying a style should report which values changed and which local overrides remain, rather than making an unexplained visual change.
Handle shared-style propagation
Local edits can update every layer using a style immediately. In a shared library workflow, a published change must be published and then accepted by subscribed files, according to Figma’s documentation. Represent style versions or snapshots so undo, review, and conflict resolution are possible.
Measure after fonts are ready
Web fonts can load after first paint. If you measure with a fallback font and never remeasure, line breaks, cached widths, line height, and caret placement can become stale. Wait for font readiness where possible, invalidate text measurements when a font face or weight changes, and redraw after the final metrics arrive. Save the selected range in logical text offsets rather than screen coordinates.
Rich text requires ranges and selection semantics
“Rich text” is not a single capability. Canva’s developer documentation lists font size, text color, font weight, italics, underline, strikethrough, and hyperlinks as rich-text attributes in its app API context. Your own contract should name the attributes you support and how they combine.
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Represent runs, not just one style
Store a base paragraph style and a sorted set of ranges such as {start, end, attributes}. Normalize adjacent ranges with identical attributes, reject overlapping malformed ranges, and preserve hyperlink targets separately from visual decoration. A selection spanning several runs should expose a mixed state in the toolbar rather than choosing an arbitrary value.
Canvas limitations
Konva’s standard Text object cannot apply different styles to separate portions of one text object. If you need bold phrases, inline links, or mixed colors, use multiple text instances, a richer rendering technique, or a DOM editing surface. Multiple instances require careful baseline and line-wrap coordination; a DOM or specialized rich-text renderer can provide more complete selection behavior.
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- Use composition events so East Asian and other IME input is not committed character by character.
- Preserve selection direction and affinity when applying a range format.
- Make links keyboard reachable in editing mode, while preventing accidental navigation during ordinary canvas selection.
- Expose the layer name, role, and text content to assistive technology when the canvas is the presentation surface.
A practical document and rendering loop
The following sequence keeps rendering deterministic:
- Read the immutable text-layer record and resolve its style token and local overrides.
- Resolve the font face and wait for loading when a measurement is required.
- Lay out runs into lines using the layer’s width mode, direction, and spacing.
- Render the lines (DOM or canvas) and cache metrics keyed by content, font, width, and scale.
- Apply transforms and draw selection handles independently from glyph rendering.
- When editing ends, commit one undoable transaction containing content, ranges, and geometry changes.
Do not use a screenshot as your document model. Raster output is an export target; it cannot reliably recover text, ranges, links, or semantic order.
Build versus buy
Konva’s canvas-editor tutorial demonstrates selection, movement, resizing, undo/redo, and PNG export as a compact foundation. Polotno is described there as a commercial design-editor SDK built on Konva. Treat an SDK as an option to investigate, not as proof of current pricing, licensing, export limits, accessibility coverage, or performance. Verify those terms directly before choosing it.
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| Decision axis | Questions to answer |
|---|---|
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Troubleshooting advanced text layers
Text jumps after editing
Check for fallback-font measurement, different CSS padding between the overlay and canvas, or a device-pixel-ratio conversion error. Re-run layout after fonts load and use one coordinate conversion function for zoom and pan.
Characters disappear at the edge
Your fixed box is likely clipping without an overflow signal, or the measured width excludes letter spacing. Include trailing metrics in the layout calculation and expose overflow visually.
Bold or links affect the whole layer
A single-style canvas text object cannot represent per-range formatting. Split runs or switch to a renderer that supports attributed text, and apply toolbar commands to the selected range rather than the whole node.
Undo corrupts selection
Record selection anchors and focus separately from content transactions. Restore logical offsets after undo, then clamp them to the restored string.
IME input is duplicated
Do not commit every input event while composition is active. Track compositionstart and compositionend, then commit the final value once.
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FAQ
Should every text layer be content-editable?
No. Use native editing where users type, and keep display-only layers non-editable while preserving semantic text in your model.
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No. A text style is a reusable set of typography values; rich text applies attributes to ranges inside a layer.
Can canvas provide accessible text editing by itself?
Canvas does not provide native caret and selection editing. Pair it with a DOM control or choose a DOM-first editor.
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