#1: Triple-click within a table cell, and the entire cell should be selected.

Click HERE I shouldn't be selected Not should I.

#2: Triple-click a line within a table cell, and only that line should be selected.

Click HERE and only this line will be selected. Despite their being no line break between this sentence and the previous sentence, this sentence should NOT be selected when the previous line is triple-clicked. I also shouldn't be selected
Neither should I Neither should I

#3: Lines terminated by a Line Break (BR)
Triple-click HERE to select this line
but not this line

#4: Lines separated by a Horizontal Rule (HR)

Triple-click HERE to select this line

but not this line

#5: Lines separated by form elements --- triple click upon each form element's text label

TEXT Checkbox Radio button Hidden

#6: Lines containing a variety of text styles

Triple click HERE (a random link) and let's see whether the entire line is selected.