Definition

Tab order (or keyboard navigation order) is an HTML attribute or logical sequence that precisely defines the specific, predictable order in which the focus moves between interactive elements on a web page when a user navigates solely using a keyboard, typically by pressing the "Tab" key. It dictates the sequential flow of keyboard accessibility.

Explanation

Consider a user who has a motor disability and cannot use a traditional mouse, or perhaps a user who prefers keyboard navigation for efficiency. Their primary means of interacting with your webpage will be by pressing the "Tab" key to move from one interactive element to the next (e.g., links, buttons, and form fields). However, if the tab order on your webpage hasn't been meticulously defined, the focus might jump erratically and unpredictably from one element to another, skipping over important content or moving in a confusing, non-linear fashion. This chaotic navigation sequence will undoubtedly disorient and frustrate your users, making your website difficult, if not impossible, to use effectively.

This is precisely why establishing a logical and intuitive tab order is absolutely critical. The tab order dictates the specific sequence in which the keyboard focus shifts between the interactive elements present on your webpage. When your user presses the "Tab" key, the visual focus indicator (the outline around the active element) will smoothly and predictably shift to the next element in the predefined order. This order should ideally follow the visual flow of the page—from top to bottom, and left to right—or a logical content hierarchy.

By properly setting the tab order, you provide a clear and predictable path for keyboard-only users, allowing them to:

• Navigate efficiently: Users can quickly move through the page and find the content or interactive elements they need without getting lost.
• Understand page structure: A logical tab order reinforces the visual layout and hierarchy of your content, aiding comprehension.
• Complete tasks effectively: Filling out forms, clicking buttons, or accessing links becomes a seamless experience.

Ensuring a well-thought-out tab order is a fundamental aspect of keyboard accessibility, which directly supports individuals with motor disabilities, some cognitive disabilities, and power users who prefer keyboard shortcuts, thereby significantly improving the overall usability and inclusivity of your website.