luhn-generator
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A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm
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Markdown
# tabindex-no-positive
Avoid positive `tabIndex` property values to synchronize the flow of the page with keyboard tab order.
## Rule details
This rule takes no arguments.
### Succeed
```jsx
<span tabIndex="0">foo</span>
<span tabIndex="-1">bar</span>
<span tabIndex={0}>baz</span>
```
### Fail
```jsx
<span tabIndex="5">foo</span>
<span tabIndex="3">bar</span>
<span tabIndex="1">baz</span>
<span tabIndex="2">never really sure what goes after baz</span>
```
## Accessibility guidelines
- [WCAG 2.4.3](https://www.w3.org/WAI/WCAG21/Understanding/focus-order)
### Resources
- [Chrome Audit Rules, AX_FOCUS_03](https://github.com/GoogleChrome/accessibility-developer-tools/wiki/Audit-Rules#ax_focus_03)