Get Text in Selenium/SeleniumLibrary returns the visible text in a tag – e.g. what the browser renders in the viewport. Naturally, anything that is in a <script> is not that – it’s code that will be executed (regardless what it’ll do – put some text out there or not, it is code).
You can still get the tag’s content though – every DOM element has an attribute innerHTML, that is its raw content (before rendering and so on). So try this:
${response} Get Element Attribute css=body script:nth-child(9) innerHTML
This will of course return you everything (because the response is the raw content) – "Metro.toast.create(", etc – so you’ll have to manipulate the output a bit, to get just the method’s argument.
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