Why does viewport set site width by default on iphone?

Question

Browsers

Good time, I came across a site that needed to be adapted
Media query works fine on mobile devices, but here's the viewport , for some reason on the mobile version of safari, when recording, content="width=device-widthit does not set the site size to the screen size, on Android everything is gorgeous. I don’t know what to sin for, only width 320px helped, which is not buzzing.
Now, for now, there is only width without zooms, because it sets the default size to 980px for safari.
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