javascript - Adjust keyboard options on first page on tablets and mobiles -

i have seen on websites when fill in form field, keyboard shows/hides characters on first page of touch keyboard.

this used number of uses:

• if on online html editor mobile devices, not keep on searching '<' , '>' on keyboard in different pages. preferably them on first page easy access.

• if coding in python , using comments on online editor '#' in easy reach.

• i have seen websites put '@' symbol on first page in email address field.

do know framework use customise keyboard this? javascript, jquery, or plain css , html? different apple/android?