Timeline Creator
Create interactive HTML timelines and project roadmaps with Gantt charts and milestones.
When to Use
- "Create timeline for [project]"
- "Generate roadmap for Q1-Q4"
- "Make Gantt chart for schedule"
- "Show project milestones"
Components
- Timeline Header: project name, date range, completion %
- Phase Groups: Q1, Q2, Q3, Q4 or custom phases
- Timeline Items: tasks with start/end dates, progress, status
- Milestones: key deliverables with dates
- Gantt Visualization: horizontal bars showing duration
HTML Structure
<!DOCTYPE html>
<html>
<head>
<title>[Project] Timeline</title>
<style>
body { font-family: system-ui; max-width: 1400px; margin: 0 auto; }
.timeline-bar { background: linear-gradient(90deg, #4299e1, #48bb78); height: 20px; border-radius: 4px; }
.milestone { border-left: 3px solid #e53e3e; padding-left: 10px; }
/* Status colors: #48bb78 (done), #4299e1 (in-progress), #718096 (planned) */
</style>
</head>
<body>
<h1>[Project] Timeline</h1>
<!-- Phase sections with timeline bars -->
<!-- Milestones list -->
</body>
</html>
Timeline Bar Pattern
<div class="timeline-item">
<span>Task Name</span>
<div class="timeline-bar" style="width: [percentage]%; background: [status-color];"></div>
<span>[start] - [end]</span>
</div>
Workflow
- Extract tasks, dates, phases from project
- Calculate duration percentages
- Group by phases (quarters or custom)
- Create HTML with Gantt-style bars
- Add milestones section
- Write to
[project]-timeline.html
Use semantic colors for status, keep layout responsive.