Within js/levels.js on line 374, the example text is missing an '=' symbol.
Replace the current line 374:
"<strong>//img[substring(@src, string-length(@src) - string-length('.jpg')+1 ) '.jpg' ]</strong> selects all images display a <strong>.jpg</strong> image.",
with
"<strong>//img[substring(@src, string-length(@src) - string-length('.jpg')+1 ) = '.jpg' ]</strong> selects all images display a <strong>.jpg</strong> image.",
Within js/levels.js on line 374, the example text is missing an '=' symbol.
Replace the current line 374:
"<strong>//img[substring(@src, string-length(@src) - string-length('.jpg')+1 ) '.jpg' ]</strong> selects all images display a <strong>.jpg</strong> image.",
with
"<strong>//img[substring(@src, string-length(@src) - string-length('.jpg')+1 ) = '.jpg' ]</strong> selects all images display a <strong>.jpg</strong> image.",