Hidden labels for text inputs

1) Label hidden with display: none;

Label for Text1

2) Label hidden with visibility: hidden;

Label for Text2

3) Label hidden with html5 'hidden' attribute

4) Label hidden with display: none; and pointed to by 'aria-labelledby'

Label for Text4

5) Label hidden with visibility: hidden; and pointed to by 'aria-labelledby'

Label for Text5

6) Label hidden with html5 'hidden' attribute, and pointed to by 'aria-labelledby'

7) Label using 'aria-label' attribute, and no label element