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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Portable Offline Markdown Viewer</title>
<style>
body, html {
margin: 0;
padding: 0;
height: 100%;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
overflow: hidden; /* Prevent body scrollbars when panes are full height */
}
.container {
display: flex;
height: 100vh; /* Full viewport height */
width: 100vw; /* Full viewport width */
}
.pane {
flex-grow: 1; /* Panes share space equally by default */
flex-basis: 0; /* Allow flex-grow to distribute space from a zero basis */
overflow: auto; /* Add scrollbars if content overflows */
padding: 15px;
box-sizing: border-box;
height: 100%; /* Make panes take full height of container */
}
#input-pane {
background-color: #fdfdfd;
border-right: 1px solid #e0e0e0; /* Subtle border */
}
#markdown-input {
width: 100%;
height: 100%;
border: 1px solid #d1d5da;
box-sizing: border-box;
padding: 10px;
font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
font-size: 14px;
line-height: 1.5;
resize: none; /* Disable textarea's own resizer */
background-color: #fff;
color: #24292e;
}
#markdown-input:focus {
outline: none;
border-color: #0366d6;
box-shadow: 0 0 0 2px rgba(3, 102, 214, 0.3);
}
#output-pane {
background-color: #ffffff;
padding-left: 20px; /* More space from resizer */
}
#html-output {
width: 100%;
height: 100%;
color: #24292e;
line-height: 1.6;
}
/* Basic Markdown Styling (inspired by GitHub) */
#html-output h1, #html-output h2, #html-output h3, #html-output h4, #html-output h5, #html-output h6 {
margin-top: 24px;
margin-bottom: 16px;
font-weight: 600;
line-height: 1.25;
border-bottom: 1px solid #eaecef;
padding-bottom: 0.3em;
}
#html-output h1 { font-size: 2em; }
#html-output h2 { font-size: 1.5em; }
#html-output h3 { font-size: 1.25em; }
#html-output p { margin-top: 0; margin-bottom: 16px; }
#html-output ul, #html-output ol { margin-top: 0; margin-bottom: 16px; padding-left: 2em; }
#html-output li > p { margin-bottom: 0.2em; } /* Less space for p inside li */
#html-output blockquote {
margin: 0 0 16px 0;
padding: 0 1em;
color: #6a737d;
border-left: 0.25em solid #dfe2e5;
}
#html-output code {
padding: 0.2em 0.4em;
margin: 0;
font-size: 85%;
background-color: rgba(27,31,35,0.05);
border-radius: 3px;
font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}
#html-output pre {
padding: 16px;
overflow: auto;
font-size: 85%;
line-height: 1.45;
background-color: #f6f8fa;
border-radius: 3px;
margin-bottom: 16px;
word-wrap: normal; /* Allow horizontal scroll for long lines */
}
#html-output pre code {
padding: 0;
margin: 0;
font-size: 100%;
background-color: transparent;
border-radius: 0;
display: inline;
max-width: auto;
overflow: visible;
line-height: inherit;
word-wrap: normal;
}
#html-output table {
border-collapse: collapse;
margin-top: 0;
margin-bottom: 16px;
display: block;
width: max-content;
max-width: 100%;
overflow: auto;
}
#html-output th, #html-output td {
padding: 6px 13px;
border: 1px solid #dfe2e5;
}
#html-output th { font-weight: 600; }
#html-output hr {
height: 0.25em;
padding: 0;
margin: 24px 0;
background-color: #e1e4e8;
border: 0;
}
#html-output img { max-width: 100%; box-sizing: content-box; background-color: #fff; }
.resizer {
width: 10px;
background-color: #e0e0e0; /* Slightly darker for better visibility */
cursor: col-resize;
flex-shrink: 0; /* Prevent resizer from shrinking */
display: flex;
align-items: center;
justify-content: center;
position: relative; /* For pseudo-element positioning */
z-index: 10;
}
.resizer:hover {
background-color: #c0c0c0;
}
.resizer::before { /* Visual grip dots */
content: '⋮';
color: #666;
font-size: 14px;
line-height: 0; /* Center vertically */
}
</style>
<!-- Make sure marked.min.js is in the same folder as this HTML file -->
<script src="marked.min.js"></script>
</head>
<body>
<div class="container">
<div class="pane" id="input-pane">
<textarea id="markdown-input" placeholder="Paste or type Markdown here..."></textarea>
</div>
<div class="resizer" id="dragMe"></div>
<div class="pane" id="output-pane">
<div id="html-output"></div>
</div>
</div>
<script>
const markdownInput = document.getElementById('markdown-input');
const htmlOutput = document.getElementById('html-output');
const resizer = document.getElementById('dragMe');
const leftPane = document.getElementById('input-pane');
const rightPane = document.getElementById('output-pane');
const container = document.querySelector('.container');
// Function to render Markdown
function renderMarkdown() {
const mdText = markdownInput.value;
try {
// Using marked.parse() for marked v4+
// gfm: true for GitHub Flavored Markdown
// breaks: true for rendering single newlines as <br> (common preference)
htmlOutput.innerHTML = marked.parse(mdText, { gfm: true, breaks: true, pedantic: false });
} catch (e) {
// Fallback for older marked versions or if marked.parse is not available
try {
htmlOutput.innerHTML = marked(mdText, { gfm: true, breaks: true, pedantic: false });
} catch (innerErr) {
htmlOutput.innerHTML = "<p style='color:red;'>Error rendering Markdown. Check browser console.</p>";
console.error("Markdown rendering error:", innerErr);
}
}
}
// Initial render and on input
markdownInput.addEventListener('input', renderMarkdown);
// Resizer logic
let isResizing = false;
resizer.addEventListener('mousedown', (e) => {
e.preventDefault(); // Prevent text selection during drag
isResizing = true;
document.body.style.userSelect = 'none'; // Prevent text selection globally
// Set flex-grow to 0 so flex-basis takes full control during resize
leftPane.style.flexGrow = '0';
rightPane.style.flexGrow = '0';
document.addEventListener('mousemove', handleMouseMove);
document.addEventListener('mouseup', stopResize);
});
function handleMouseMove(e) {
if (!isResizing) return;
const containerRect = container.getBoundingClientRect();
let leftWidth = e.clientX - containerRect.left;
// Minimum pane width (e.g., 30px to still see/drag resizer)
// Set to 0 if you want to allow complete collapse, but might be hard to reopen.
const minPaneWidth = 30;
const resizerWidth = resizer.offsetWidth;
// Constrain left pane
if (leftWidth < minPaneWidth) {
leftWidth = minPaneWidth;
}
if (leftWidth > containerRect.width - resizerWidth - minPaneWidth) {
leftWidth = containerRect.width - resizerWidth - minPaneWidth;
}
const rightWidth = containerRect.width - leftWidth - resizerWidth;
leftPane.style.flexBasis = `${leftWidth}px`;
rightPane.style.flexBasis = `${rightWidth}px`;
}
function stopResize() {
isResizing = false;
document.body.style.userSelect = ''; // Re-enable text selection
document.removeEventListener('mousemove', handleMouseMove);
document.removeEventListener('mouseup', stopResize);
// The flex-grow 0 and pixel-based flex-basis will persist.
// This means after a manual resize, the panes won't auto-adjust to window resizes
// unless we convert back to percentages or restore flex-grow:1.
// For this tool, fixed pixel widths after manual drag is often acceptable.
}
// Set some default Markdown content
markdownInput.value = `# Welcome to Your Offline Markdown Viewer!
## How to Use
1. **Paste or type** your Markdown text into this left pane.
2. The **rendered HTML** will appear live in the right pane.
3. **Drag the vertical bar** in the middle to resize the panes. You can shrink one pane almost completely to focus on the other.
## Features
* **Live Preview:** Updates as you type.
* **GitHub Flavored Markdown (GFM):** Includes support for tables, fenced code blocks, etc.
* **Line Breaks:** Single newlines are rendered as line breaks (\`<br>\`).
* **Portable & Offline:** Just this HTML file and \`marked.min.js\` in the same folder. No installation needed!
---
### Example Markdown:
\`\`\`javascript
// Code block example
function greet(name) {
return \`Hello, \${name}!\`;
}
console.log(greet("Markdown User"));
\`\`\`
- Item 1
- Item 2
- Sub-item A
- Sub-item B
> This is a blockquote. It's useful for highlighting text.
**Bold text**, *italic text*, and \`inline code\`.
A horizontal rule:
***
A table:
| Header 1 | Header 2 | Header 3 |
|----------|----------|----------|
| Cell 1A | Cell 2A | Cell 3A |
| Cell 1B | Cell 2B | Cell 3B |
`;
renderMarkdown(); // Render the default text on load
</script>
</body>
</html> |