This is very cutting edge, but basically Chrome has now shipped the ability to parse processing instructions in HTML, it would be good to start looking at language server support for this.
In particular at a minimum the punctuation and target should be highlighted. It's also intended that data will be treated like attributes so it probably makes sense to also highlight the data as if it were a list of attributes too.
Ideally we also integrate into custom data as well, so that we can have tooltips for both processing instruction targets and their "attributes".
This is very cutting edge, but basically Chrome has now shipped the ability to parse processing instructions in HTML, it would be good to start looking at language server support for this.
In particular at a minimum the punctuation and target should be highlighted. It's also intended that data will be treated like attributes so it probably makes sense to also highlight the data as if it were a list of attributes too.
Ideally we also integrate into custom data as well, so that we can have tooltips for both processing instruction targets and their "attributes".