Size Considerations

HTML5 History makes pushing large amounts of data onto the stack easy if you’re not careful. For example, the undo demo above stores ~0.5MB per state and could easily use more if the canvas was larger. This data will consume memory as long the associated state entry remains in the session history, which can be long after the user leaves your site. The more data you store, the sooner a browser may start clearing your entries out to save space. In addition, some browsers also enforce a hard limit on the amount of data that can be stored with a single call to pushState or replaceState.