Pressing the Tab key in Core does not select or highlight any button or other form element on a web page. This happens on a Mac Safari browser.
You can resolve this issue by taking these steps:
- Open the Safari browser on your Mac.
- Select Safari > Preferences > Advanced.
- To make it easier to navigate links and form elements, check the option 'Press Tab to highlight each item on a webpage.'
When this option is checked, pressing Tab allows you to go to the next link or form element on a web page; pressing Shift + Tab will take you back to the previous item. If you also hold down the Option key, you can skip the links and highlight only the next or previous form element.
Check this for more: Safari Keyboard Shortcuts