Created attachment 361388 [details] Test case to reproduce the issue What steps will reproduce the problem? (1) Load the attached case (2) Select all the text elements (3) Click on ident button (4) Click on outdent button What is the expected result? After step 3, both text elements are indented and are still inline children of the block with blue border (see indent-outdent-firefox.html) After step 4, both text elements are outdented, getting back to the original rendered HTML (indent-outdent-firefox-1.html What happens instead? After step 3, both text elements are indented but they have their own parents; they are not siblings anymore. (see indent-outdent-chrome.html) After step 4, the text elements in the first line is not children of the block with blue border (see indent-outdent-chrome-1.html)