Date Add / Subtract Calculator
About Tab Order Visualizer
The Keyboard Tab Order & Focus Sequence Visualizer maps the exact sequence in which interactive UI elements receive keyboard focus (`tabindex="0"`, `tabindex="-1"`, positive `tabindex`), drawing sequential visual flow lines and flagging focus order traps according to WCAG 2.1 SC 2.4.3.
How to Use Tab Order Visualizer
Step 1
Paste HTML markup into the editor.
Step 2
Review the step-by-step numbered keyboard tab sequence.
Step 3
Inspect flagged out-of-order jumps and positive `tabindex` anti-patterns.
Step 4
Click "Copy Sequence Analysis".
Practical Use Cases for Tab Order Visualizer
Keyboard Navigation & Focus Sequence UX Auditing
Verify that keyboard navigation follows a logical reading order (left-to-right, top-to-bottom) and does not jump unexpectedly across page sections.
Positive `tabindex` Anti-Pattern Detection & Modal Trap Verification
Identify dangerous positive `tabindex` values (e.g. `tabindex="1"`) that disrupt standard DOM tab navigation order.
Input & Output Examples
Visualizing Form Tab Order with Positive Tabindex Anti-Pattern
Markup containing `<button tabindex="3">` and `<input tabindex="1">`
Warning: `Positive tabindex detected!` | Issue: `Breaks natural DOM focus order` | Fix: `Remove positive tabindex; use DOM source ordering and tabindex="0"`
Key Features & Performance
- ✓Focus Flow Graph: generates an ordered numbered list and visual connector diagram of every focusable element.
- ✓Positive Tabindex Detector: highlights anti-patterns where explicit integer tab indices corrupt logical keyboard flows.
- ✓Native vs. Custom Element Classification: distinguishes native interactive tags (`<button>`, `<a>`, `<input>`) from custom ARIA widgets.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy tab order sequence report.
Key Terminology & Definitions
Logical Focus Order (WCAG SC 2.4.3)
A Level A requirement mandating that when a web page can be navigated sequentially, focusable components receive focus in an order that preserves meaning and operability.
`tabindex="-1"`
An attribute making an element programmatically focusable via JavaScript (`element.focus()`) while removing it from standard sequential keyboard Tab navigation.