I have an old Safrai Browser (5.1.7 - Windows 7) to test design for the apple users.
The blue background is white in this browser.
So you can see white writing on white background.
The buttons work.
I tested the samples on the Gigo homepage with my Safari Browser. There are problems with...
Nested Grids (Material Design) : Display problems with the glyphs in the first colum
Tree is not okay (Material Design): Display problems with the glyphs
Bootstrap 4 Modal Resizable - the little close Button in the top right corner make trouble
Material Design TreeView: Display problems with the glyphs
Material Design TreeView with Checkboxes / TreeView Drag And Drop 1: Display problems with the glyphs and the distance to checkboxes isn't correct (very big)
Material Design WYSIWYG Editor: Display problems with the glyphs and the toolbar
Bootstrap 4 Checkbox: unckecked button don't work
Material Design DatePicker: Display problems with the arrow glyphs
I have an old Safrai Browser (5.1.7 - Windows 7) to test design for the apple users. The blue background is white in this browser. So you can see white writing on white background. The buttons work.