The SVG specification defines three properties to reference markers: marker-start, marker-mid, marker-end. It also provides a shorthand property,marker. Using the marker property from a style sheet is equivalent to using all three (start, mid, end). However, shorthand properties cannot be used as presentation attributes.
Run the test. No interaction required.
The test passes if the two rows of shapes are identical, and that all of the shapes have small blue markers (26 in total per row).