This command is available only when designMode is set to 'on' or there is at least one editable element which has contenteditable attribute, and the built-in editor has not handled the insertParagraph, delete, or forwardDelete command.
This new behavior can also be enabled by web apps themselves for all channels with a call of document.execCommand('enableCompatibleJoinSplitDirection', false, 'false') (introduced in bug 1810663). Similarly, when two nodes are joined, the built-in editor deletes the latter node and moves its children to end of the preceding node.
When a node is split, the built-in editor creates new node after the original one, i.e., creates the right node. It lets you view Web pages faster, using less of your computer's memory. Starting with Firefox 113, Nightly and early beta builds now behave similar to the other browsers when splitting a node (e.g., typing Enter to split a paragraph) and joining two nodes (e.g., typing Backspace at start of a paragraph to join the paragraph and the previous one) when using the built-in editor. Free Download Mozilla Firefox Latest Version Standalone Offline Installer (32-bit/64-bit) for Windows PC is a fast, secure, and easy-use web browser with many advantages over other web browsers, tabbed browsing and the ability to block pop-up windows.
