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Re:Why the Gov.uk Design System team changed the input type ... by Wowfunhappy on Thursday February 27, 2020 @06:34PM (#22439118)
It would be the same markup. It just wouldn't do anything on desktop. Which is fine because desktops generally have physical keyboards.

I apologize if you already know this, but to make sure we're on the same page: what "inputmode" does is tell phones to display the onscreen keyboard as a numpad, instead of a full set of QWERTY letters and numbers. Outside of a few edge-cases, you don't generally need that on desktop.

Re:Why the Gov.uk Design System team changed the input type ... by brlewis on Thursday February 27, 2020 @11:25PM (#22440509)
TBH I went on autopilot looking at MDN's browser compatibility list. Also as a user of Firefox on Android I was interested in something that works there, but type="tel" doesn't behave any better. The only advantage to not using inputmode is getting rid of an HTML validator warning, so you're right.