3.3.2 Labels or Instructions (Level A)
For any element that requires user input or action, provide concise labels and/or instructions.
3.3.1 Error Identification (Level A)
When any input error is automatically detected, alert the user, describe the error, and provide instructions on how to correct it.
3.2.2 On Input (Level A)
Nothing on a website should automatically change just because a user inputs text, checks a box, or navigates down a drop-down box.
3.2.1 On Focus (Level A)
Nothing on a website should automatically change just because it receives focus.
3.1.2 Language of Parts (Level AA)
If the language of a page or parts of a page is different from the default language of the website, the change needs to be indicated in the HTML code.