Consider supporting `call` for pseudo commands

Assume there exists a `` on the page.

If I try:

```html

Show Modal

```

Then this doesn't work, because `show` is a command, and therefore the `()` are syntax errors.

I therefore need to instead do:

```html

Show Modal

```

In order for it do be correctly interpreted. This is fine, to disambiguate. But what about supporting:

```html

Show Modal

```