This patch is a follow-up patch to 35c9f0dc2f3665d4f9d9ece328cee4559bbec9c6. It changes the `computeStyle` function to handle situations where non string based values are returned from `window.getComputedStyle`. This situation usually ocurrs in Node-based test environments where the element or `window.getComputedStyle` is mocked out. PR Close #35810