Unfortunately, it is not possible to achieve the exact same appearance for the displayed text using CSS. This is due to the different rendering of the tab under the different browsers.
In addition, I believe I was not clear enough with my suggestion, which I apologize for. To ensure that the displayed text looks exactly the same in all browsers, my suggestion was to create an image that contains the displayed text and set it as an icon to the sliding pane - when only image is displayed in the tab, it is sized according to the image, i.e. for vertical splitter the height of the sliding pane's tab will match the height of the image.
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