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Focus Order Visualizer

Paste HTML and see the exact keyboard tab sequence for all focusable elements. Detect tabindex anti-patterns, missing focus targets, and order issues instantly.

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How to Use Focus Order Visualizer

  1. 1

    Paste your HTML

    Copy the HTML source code you want to analyze and paste it into the input area.

  2. 2

    Click Visualize Focus Order

    Press the button to parse all focusable elements and compute the tab order sequence.

  3. 3

    Review the sequence

    See numbered focusable elements in tab order, with issues highlighted. Fix positive tabindex values and ensure all interactive elements are reachable via keyboard.

Frequently Asked Questions

Positive tabindex values (tabindex='1', tabindex='2', etc.) override the natural DOM tab order. This means the tab sequence no longer matches the visual layout, creating confusion for keyboard users. Elements with positive tabindex receive focus before all other focusable elements, regardless of their position in the document. Use tabindex='0' instead to add elements to the natural tab order.

Setting tabindex='-1' removes an element from the keyboard tab order but allows it to receive focus programmatically via JavaScript (element.focus()). This is useful for managing focus in modal dialogs, error messages, or custom widgets. However, applying it to normally interactive elements like buttons or links means keyboard users cannot reach them.

Links with href attributes, buttons, form inputs (text, checkbox, radio, etc.), select elements, and textareas are all natively focusable without tabindex. Elements like div and span are not focusable by default. To make custom interactive elements focusable, add tabindex='0' and an appropriate ARIA role.

No. All focus order analysis happens entirely in your browser using the DOMParser API. Your HTML source code never leaves your device.

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Understanding Keyboard Focus Order

Focus order is the sequence in which interactive elements receive keyboard focus when a user presses the Tab key. For keyboard-only users, including those with motor disabilities who cannot use a mouse, the focus order determines how they navigate and interact with a page. WCAG 2.2 Success Criterion 2.4.3 (Focus Order) requires that when a page can be navigated sequentially, focusable components receive focus in an order that preserves meaning and operability.

How Tab Order Works

By default, the tab order follows the DOM order of elements. When a user presses Tab, focus moves to the next focusable element in the document source order. This natural flow typically matches the visual reading order, making navigation intuitive. The tabindex attribute can modify this behavior. A value of 0 places an element in the natural tab order at its DOM position. A positive value forces the element to receive focus before elements with tabindex="0" or no tabindex. A value of -1 removes the element from the tab order entirely.

The Tabindex Anti-Pattern

Using positive tabindex values is considered an anti-pattern by accessibility experts. When elements have tabindex="1", "2", "3", etc., the browser processes all positive-tabindex elements first in ascending order, then proceeds to tabindex="0" and naturally focusable elements. This creates a disconnect between the visual layout and the keyboard navigation sequence. As pages grow and change, maintaining a coherent positive tabindex scheme becomes increasingly fragile and error-prone. The solution is always to arrange elements in the correct order in the DOM and use CSS for visual positioning.

Custom Interactive Elements

When building custom interactive components using <div> or <span> elements, you must add tabindex="0" to make them keyboard-focusable. However, tabindex alone is not sufficient. Custom interactive elements also need an appropriate ARIA role (such as "button", "tab", or "link") and keyboard event handlers for Enter and Space keys. Native HTML elements like <button> and <a> handle all of this automatically, which is why using native elements is always preferred.

Focus Management in Dynamic Content

Single-page applications and dynamic content present additional focus management challenges. When content changes without a page reload, focus should be moved to the new content so keyboard users are aware of the change. Modal dialogs should trap focus within the dialog and return focus to the triggering element when closed. Removed content should not leave focus stranded on an invisible element. The tabindex="-1" attribute combined with JavaScript element.focus() is the standard technique for programmatic focus management in these scenarios.

Testing Focus Order

This tool analyzes static HTML to determine the theoretical tab order. For a complete focus order audit, also test your live page by pressing Tab repeatedly and observing whether focus moves logically through the interface. Watch for focus disappearing (moving to invisible elements), skipping important controls, or jumping to unexpected locations. Browser developer tools can highlight the currently focused element to help track focus movement.