Failing to set selectionStart on email type inputs

[arjunattam]

(testing Playwright and Studio on VSO login flow)

after #353 was merged, I ran into a new error in trying to fill in the email in the VSO login flow (screenshot below for reference)

Error: Evaluation failed: DOMException: Failed to set the 'selectionStart' 
property on 'HTMLInputElement': The input element's type ('email') 
does not support selection.

This error is caused by the lines at https://github.com/microsoft/playwright/blob/master/src/input.ts#L349 where we assume the selectionStart attribute exists on the input. After #353 this assumption is incorrect, since the email type does not support it.

    input.selectionStart = 0;
    input.selectionEnd = input.value.length;

Commenting these two lines fixes this particular issue, and I could send a PR to not execute these lines for email and other invalid types. Would that be a good idea?