Modern browsers can save changes in local storage. Engage this feature by selecting the <b>Local editing</b> option at the bottom of this web page.
Notice: this is an under developed experimental feature. It takes some ingenuity to even see what it is doing. However, you will know you are seeing a locally stored page because it will have a tinted background.
Local Edits
Here we list pages known to have locally stored copies. These copies aren't accessed unless local editing is selected.