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I thought that when you are actually using deeplapi() in your question, that function doesn't return the value. Because the last line of the function is Logger.log(data);. And also, in your following situation (This is from your question),

You are using the function deeplapi() as deeplapi(value1, value2, value3). But, your function deeplapi() doesn't use the arguments. I thought that these might be the reason of your issue.

If you want to use your function as deeplapi(value1, value2, value3), how about the following modification?

I believe your goal as follows.

• You want to translate the following situation.

  • From

EDIT (following the comment)

You need to wrap the formula in the IFERROR function

This is a known issue, and it is a design decision by Google to use the older translation feature. See this issue: https://issuetracker.google.com/178959844. Perhaps you could create a Feature Request to have the better translation. If so you could do it in the the same public Issue Tracker and clicking on the "Create Issue" button.

like regex

Using the function keyword changes the 'this' context. You can either save 'this' outside of the function or use arrow functions.

Here's how you would use an arrow function

Did you try using Selenium with a Chrome Webdriver to save page?

There are two issues with the HTML that prevent rendering

• extra space in delimiter: \ ( instead of \(
• pre and code elements: by default, MathJax ignores these elements, cf. skipTags in http://docs.mathjax.org/en/v2.7-latest/options/tex2jax.html

There's also extra space inside the span tag declarations (< span> etc) which you probably want to fix -- but those do not influence MathJax.

With those fixed, everything renders fine.