Testing First Testable Statement of Sec 17.7 of CSS2 Specification
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1. The speak-header property has possible values of "once | always | inherit"
PASS CRITERIA:
If statement #1 above is passed, then
the table below should have speak header of once, because of rule
"#id1 {speak-header: once}".
The table below should have speak-header of always, because of rule
"#id2 {speak-header: always}".
The table below should have speak-header of inherit, because of rule
"#id3 {speak-header: inherit}".
All other properties of this page should be UA-default.