You can click the "Edit this page" button and submit an improvement. Having said that, the fact remains that you don't have a standard syntax to add an id on a

You can click the "Edit this page" button and submit an improvement. Having said that, the fact remains that you don't have a standard syntax to add an id on a section title (without using HTML directly). Jekyll might does the right thing but Jekyll is not Markdown. Does it work elsewhere? If not then your document is not really portable.