Markdown Editor (Live Preview)

Live Markdown Editor & Preview
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Core Functionality Breakdown

  1. Marked.js Integration: We use marked.parse(input.value) to transform plain text into HTML. This handles lists, tables, bolding, and links automatically.

  2. Live Toolbar: The insertText() function manipulates the cursor position (selectionStart) to wrap selected text in Markdown syntax (e.g., adding ** for Bold).

  3. Sync Scroll: It calculates the scroll percentage of the input area and applies that same ratio to the preview area, ensuring your "view" stays roughly aligned.

  4. Responsive Panes: * Desktop: Side-by-side view using flex: 1.

    • Mobile: Stacked view (Top/Bottom) via flex-direction: column at the 768px breakpoint.

  5. AdSense Placement: * Top Banner: High visibility for revenue.

    • Bottom Banner: Non-intrusive placement for long editing sessions.

    • CSS Note: Fixed min-height for ad units prevents "layout shift" when ads load.

How to use this:

  • Replace ca-pub-YOUR_CLIENT_ID with your actual AdSense ID.

  • You can extend the preview CSS to include specific themes (like GitHub's dark mode or a classic paper style).