GramFrame Trainer Demo localStorage

← Back to demo index | Student page (sessionStorage)  |  ANALYSIS
Trainer context: The "ANALYSIS" link above triggers localStorage persistence. Annotations survive browser restarts. A "Clear gram" button is available to reset.
Mock Spectrogram
time-start0
time-end10
freq-start0
freq-end50
Test steps:
  1. Add some markers in Cross Cursor mode
  2. Reload the page — markers should still be there
  3. Close and reopen the browser — markers should still be there
  4. Click "Clear gram" button — markers should be removed
  5. Reload — markers should stay gone