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Viewport "bug" is a "feature" in iOS—change the textarea's font-size to 16px to override the auto-zoom.

This works very well:

@media screen and (-webkit-min-device-pixel-ratio:0) { select:focus, textarea:focus, input:focus { font-size: 16px; } }

It uses a css selector only available on iOS devices and enables a larger font to prevent zoom.

There are quite a few good code snippets and suggestions for improvements to the CSS here.

I only wish there was some collaborative environment we could use to request changes to the code be pulled in and utilized.