(2) Lower-Case Letters for XHTML elements
XHTML event handler attributes
- Use lower-case letters for the event handler attributes.
Compare:
Rules
| Valid | Invalid | |
|---|---|---|
| onclick | onClick | OnClick |
| onkeypress | onKeypress | OnKeyPress |
| onmouseover | onMouseover | OnMouseOver |
| onmouseout | onMouseout | OnMouseOut |
| onload | onLoad | OnLoad |
| onselect | onSelect | OnSelect |
| onchange | onChange | OnChange |
| onsubmit | onSubmit | OnSubmit |
| etc. | ||
