note: Visual mode may be more intuitive than Vim's Normal mode of operation, but it has a weakness: it doesn't always play well with the dot command.

vit

select the inner contents of a tag it command is a special kind of motion called a text object.

U

converts the selected characters to uppercase

Running j.:

Tip:

The Visual mode U command has a Normal mode equivalent: gU{motion}

Discussion

vitU can be considered as two separate commands: vit to make a selection and U to transform the selection. gUit can be considered as a single command comprise of a operator gU and a motion it.

So, we should prefer operator commands over their equivalents when working through a repetitive set of changes.

Tip22 Tip24