Unfortunately, Android doesn’t support using web pages as widgets. There are some apps that try to work around it by what amounts to periodically screenshotting a webpage, but we would recommend against that approach.
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If you have Tasker, you can build some really cool custom widgets. It takes a lot of effort, but the end result is really impressive. Here’s some examples:
Custom Homescreen on Huge Tablet
Custom ‘Remote Control’ using Tasker Scenes
Homescreen with Custom Widgets
And here’s a starter tutorial which covers the core concepts: