This is the result of the Scrimba Tutorial Notes App (registration required), specifically, the first half (excluding the setting up of Firebase / Firestore).

Much of the code was pre-written. The task was to add functionality to an existing codebase.

1. Sync notes with localStorage.
2. Create note titles from a summary of the note.
3. Move modified notes to the top of the list.
4. Delete notes.

• Markdown Notes App (Firestore): Git Repository

In the markdown editor, you can't tab through the toolbar buttons (apart from 'Write' and 'Preview'). This is because tabindex="-1" is placed on these buttons, removing them from the tab order.

ChatGPT supplied a solution, which was to give ALL the buttons (including 'Write' and 'Preview') a tabindex of zero:

function Editor({ currentNote, updateNote }) {

    ...

    useEffect(() => {
    // Function to update tabindex of toolbar buttons
    const updateTabindex = () => {
        const toolbarButtons = document.querySelectorAll(".mde-header button")
        toolbarButtons.forEach((button) => {
        button.setAttribute("tabindex", "0")
        })
    }

    // Call the function initially after the component mounts
    updateTabindex()

    // Optional: observe changes to ensure tabindex stays updated
    const observer = new MutationObserver(updateTabindex)
    const toolbar = document.querySelector(".mde-header")

    if (toolbar) {
        observer.observe(toolbar, { childList: true, subtree: true })
    }

    // Cleanup the observer on component unmount
    return () => {
        observer.disconnect()
    }
    }, []) // Empty dependency array to run only once on mount

    ...
}

On reflection, however, I have decided not to include the code. This is because:

• In order to format the text, you first have to manually select it.
• Then you have to click a formatting button.
• But, if you reverse tab from the selected text to a toolbar button, the text selection disappears, so there is nothing for the button to format.

Conclusion: the toolbar formatting buttons are inherently inaccessible to keyboard navigation. (But you can still write and preview markdown code.)

Tested on Windows 10 with:

• Chrome
• Firefox
• Microsoft Edge

Page tested in both browser and device views.