Why Does Tab Key Navigation Jump Around My Website? Tabindex Explained for Small Business Websites
If your audit flagged "keyboard focus order is broken," the page looks completely normal to a mouse user - this is another one of those problems nobody notices by eye. It only shows up the moment someone tries to get through your site by pressing Tab instead of clicking, and for a real slice of your visitors, that's the only way they can use it at all.
What keyboard navigation order actually is
Every interactive element on a page - links, buttons, form fields - can receive "focus," and pressing Tab moves focus to the next one in sequence. By default, that sequence simply follows the HTML top to bottom, which is why it normally lines up with the visual layout without anyone deciding it on purpose: the header link comes before the hero button, which comes before the first form field, in the same order a sighted visitor's eye naturally travels down the page.
Where tabindex comes in
tabindex is an HTML attribute that can override that default order. Set to "0", it simply puts an element into the normal Tab sequence at its natural position - harmless, and sometimes necessary for elements that aren't focusable by default. Set to a positive number like tabindex="5", it does something different: it tells the browser to visit that element at a specific point in a hand-picked order, ahead of anything with a lower or no explicit value, regardless of where it actually sits on the page.
A "call now" button gets tabindex="1" so it feels prominent, and a couple of sidebar links get tabindex="2"/tabindex="3" for the same reason. The moment even one positive value exists on the page, the browser stops following the visual layout and instead builds its Tab order around those hand-picked numbers first, then falls back to document order for everything else.
Leave interactive elements with no tabindex at all (the default, natural order) or tabindex="0" if one genuinely needs to be added to the sequence. If something needs to feel prominent, that's a visual/CSS decision - size, color, position on the page - not a Tab-order decision.
Why one positive value breaks the whole page
The problem isn't the one element with the positive tabindex - it's everything else. Once a hand-picked order exists anywhere on the page, a keyboard-only visitor pressing Tab can jump from the footer straight to a sidebar button, back up to the middle of the page, then down again, with no way to predict where focus goes next. On a form or checkout flow especially, a scrambled order like that can make it genuinely impossible to get through the page in order - not just annoying, but a real block on completing a purchase or submitting a contact request.
Who this actually affects
Visitors with a motor impairment that makes precise mouse control difficult or painful rely on the keyboard as their primary input. Screen reader users navigate mostly by keyboard too, not mouse, so a scrambled Tab order compounds directly with whatever else is already hard to parse audibly. And plenty of sighted, able-bodied visitors simply Tab through a long form because it's faster than reaching for a trackpad between fields - all three groups depend on the same thing: a predictable order that matches what they can see or expect.
The fix
Remove the positive tabindex values. If an element needs to be reachable by keyboard and isn't by default (a <div> acting as a button, for example), give it tabindex="0" instead of a positive number, and let the browser's natural document order handle sequencing. If something genuinely needs to come earlier in the visual flow for keyboard users, the real fix is moving it earlier in the HTML - not overriding the order with a number.
How to check your own site
Click once on the page background so nothing has focus, then press Tab repeatedly and watch which element highlights next - a visible outline should move smoothly down the page in the same order things actually appear. If focus ever jumps somewhere unexpected (bottom of the page to the top, or past a button entirely), that's the exact gap the free audit also flags automatically, naming exactly how many elements it found.
How the free audit catches this
Keyboard focus order is one of the automated checks in our free audit, run alongside the rest of the accessibility items covered in is my website ADA compliant and our full website audit checklist. The report names exactly how many elements break the sequence, not just a generic warning.
Frequently asked questions
What does "keyboard navigation order" mean on a website?
It's the order your browser moves through links, buttons, and form fields when a visitor presses the Tab key instead of using a mouse. By default that order simply follows the HTML top to bottom, the same order a sighted visitor's eye naturally travels down the page - which is exactly why it normally just works without anyone deciding it on purpose.
What is tabindex and why does it matter?
tabindex is an HTML attribute that overrides the default Tab order on a specific element. A positive value like tabindex="5" tells the browser to visit that element at a specific point in the sequence, ahead of everything with a lower or no explicit value, regardless of where it actually sits on the page. It matters because once even one element on a page sets a positive tabindex, the whole page's Tab order stops following the visual layout.
Why does a positive tabindex break navigation?
Positive values create a competing, hand-picked order that fights the natural one - the moment any element sets tabindex="1" or higher, every other interactive element on the page gets reshuffled around it. A keyboard-only visitor pressing Tab can jump from the page footer straight to a sidebar button, back up to the middle of the page, then down again, with no way to predict where focus goes next.
Who actually navigates a website by keyboard only?
Visitors with a motor impairment that makes precise mouse control difficult or impossible, screen reader users (who navigate primarily by keyboard, not mouse), and power users who simply find Tab faster than reaching for a trackpad on a long form. All three groups rely on the Tab order being predictable to get through a page - forms and checkout flows especially, since a scrambled order there can make it impossible to actually complete a purchase or fill out a contact request.
How do I check my own site's tab order?
Click once on your page's background to make sure nothing has focus, then press Tab repeatedly and watch which element highlights next - a visible outline should move smoothly down the page in the order things actually appear. If focus ever jumps somewhere unexpected (bottom of the page to the top, or skipping past a button entirely), that is the exact gap the free audit also flags automatically, naming exactly how many elements it found.
The cheapest way to find out
Run the free audit below. We check accessibility - including this exact keyboard-focus-order test - alongside speed, SEO, and security, using the same tooling Google itself uses, and email you a plain-English report the moment something's wrong. If something needs fixing, it's a flat $149 for your fixable speed/image/SEO/broken-link issue, or $299 for everything, with before-and-after proof once it's done.