{{MyTiddler|Parameter}} full stop. This really needs a link to a tiddler with examples similar to https://tiddlywiki.com/#Transclusion%20with%20Templates . Because searching for things like “transclusion with parameters” gives results about parameters widget and \parameters pragma, which seem to be different things and only add more confusion.
{{MyTiddler||TemplateTitle|Parameter|SecondParameter}} - looks like a combination of 2. and 4. Either providing an example for 4. will automatically fix this as well, or it will need its own example, if using 2. and 4. together implies additional complexity and subtleties.
Thank you. I recall the svg parametrization from here How to visualize the content type of a tiddler? - #7 by EricShulman . Just that there it was brought up in a context more like “do it like this, trust me it works”. If you search for “template” in that thread - there’s zero results. So I could not make the logical connection with it while reading the template docs recently. I’m merely pointing to a gap in the docs, where your example would fit perfectly, since it shows both how to use the feature and a typical situation when using it is handy.
