Hi team,
Indeed, there is an accessibility bug in Splitter. It is known. Thus, I'm marking this item as a duplicate of the original one: Splitter splitbar and resizer are not visible in high contrast mode. I'm sorry that it caused you trouble.
The Splitter resizers use a background color, which is removed by High Contrast mode. You can use borders as a workaround:
<style>
.k-splitter .k-splitbar,
/* and/or */
.k-splitter .k-resize-handle {
border: 1px solid;
}
</style>
You can also:
Regards,
Hristian Stefanov
Progress Telerik