| |
| PASS A <source> whose media attribute matches is selected. |
| PASS A <source> whose media attribute does not match is not selected. |
| PASS A non-matching <source> is skipped in favor of a later matching <source>. |
| PASS A <source> without a media attribute acts as a fallback when earlier <source>s do not match. |
| PASS Changing a <source> media attribute to a matching value selects it. |
| PASS Changing a <source> media attribute to a non-matching value deselects it. |
| PASS A <source> must satisfy both its media attribute and a supported type to be selected. |
| |
