Platform cursor size used as default for custom SVG cursors if no specified size. SVG cursors can scale based on the platform accessibility/cursor settings. This can be overridden if the cursor has any specified dimensions. This feature is initially available on Windows only.
There is no way for custom SVG cursors in chromium to scale with accessibility or cursor settings. Furthermore, custom cursors with no specified size are not rendered. This feature allows web developers the option to have their custom cursors render at the typical OS cursor size and scale as that size is changed by users. This change also brings the behavior in chromium in line with the specification, which states that "The default object size for cursor images is a UA-defined size that should be based on the size of a typical cursor on the UA’s operating system".