Performance issue with moving html with javascript on mobile device? [closed]

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What is the likely performance impact for mobile devices if I use javascript to move some html from the bottom to the top of the page?

I want to create a menu like the boston globe where on mobile devices you just have a menu button, and clicking it makes the menu appear.

The issue is that my menu is at the bottom of my page. So I could absolutely position it at the top, hide it, and then reveal it when you click the button. The issue is that it will cover the content underneath it. I cant change the source order of my html, so the only solution i can think of is the use JavaScript to move the entire menu. Thanks

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Most mobile devices that you'd probably be looking to target would have quite decent JS engines. In my experience the JS performance on mobile devices is quite impressively fast so I wouldn't worry about the performance impact of moving some HTML elements around the page.