To add an element to an expression, double-click elements in the
Navigation
panel.
Click
Validate
to validate the expression.
If the expression is for the Input field, click
Test Expression
to test the expression against the example data.
Results appear each time the Developer tool evaluates the expression using the example data. The XPath expression can return a sequence of zero or more nodes or values. The
Sequence Length
indicates how many nodes the XPath expression returns.