| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| .a { visibility: visible; } | |
| .b { visibility: hidden; } | |
| body.flip .a { visibility: hidden; } | |
| body.flip .b { visibility: visible; } | |
| </style> | |
| </head> | |
| <body> | |
| <div role="toolbar"> | |
| <div role="heading" aria-label="Heading" class="a"></div> | |
| <div role="banner" aria-label="Banner" class="b"></div> | |
| </div> | |
| <script> | |
| function go() { | |
| document.body.className = 'flip'; | |
| } | |
| </script> | |
| </body> | |
| </html> |