3) PDF viewer Zoom origin supports specifiying a custom origin
  Message:
�[31m    In firefox, zoom in: Expected 'Hence, recording and compiling a trace speculates that the path andtyping will be exactly as they were during recording for subsequentiterations of the loop.Every compiled trace contains all the guards (checks) requiredto validate the speculation. If one of the guards fails (if controlflow is different, or a value of a different type is generated), thetrace exits. If an exit becomes hot, the VM can record a branchtrace starting at the exit to cover the new path. In this way, the VMrecords a trace tree covering all the hot paths through the loop.Nested loops can be difficult to optimize for tracing VMs. Ina na¨ıve implementation, inner loops would become hot first, andthe VM would start tracing there. When the inner loop exits, theVM would detect that a different branch was taken. The VM wouldtry to record a branch trace, and find that the trace reaches not theinner loop header, but the outer loop header. At this point, the VMcould continue tracing until it reaches the inner loop heade ... to be 'guards'.�[0m
  Stack:
        at <Jasmine>
        at file:///C:/pdfjs/botio-files-pdfjs/private/13f5eafa0bf6ee8/test/integration/viewer_spec.mjs:87:14
        at async Promise.all (index 0)
        at async UserContext.<anonymous> (file:///C:/pdfjs/botio-files-pdfjs/private/13f5eafa0bf6ee8/test/integration/viewer_spec.mjs:62:7)
  Message:
�[31m    In firefox, zoom out: Expected 'Hence, recording and compiling a trace speculates that the path andtyping will be exactly as they were during recording for subsequentiterations of the loop.Every compiled trace contains all the guards (checks) requiredto validate the speculation. If one of the guards fails (if controlflow is different, or a value of a different type is generated), thetrace exits. If an exit becomes hot, the VM can record a branchtrace starting at the exit to cover the new path. In this way, the VMrecords a trace tree covering all the hot paths through the loop.Nested loops can be difficult to optimize for tracing VMs. Ina na¨ıve implementation, inner loops would become hot first, andthe VM would start tracing there. When the inner loop exits, theVM would detect that a different branch was taken. The VM wouldtry to record a branch trace, and find that the trace reaches not theinner loop header, but the outer loop header. At this point, the VMcould continue tracing until it reaches the inner loop heade ... to be 'guards'.�[0m
  Stack:
        at <Jasmine>
        at file:///C:/pdfjs/botio-files-pdfjs/private/13f5eafa0bf6ee8/test/integration/viewer_spec.mjs:101:14
        at async Promise.all (index 0)
        at async UserContext.<anonymous> (file:///C:/pdfjs/botio-files-pdfjs/private/13f5eafa0bf6ee8/test/integration/viewer_spec.mjs:62:7