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Exam 70-486 topic 1 question 173 discussion

Actual exam question from Microsoft's 70-486
Question #: 173
Topic #: 1
[All 70-486 Questions]

HOTSPOT -
You are developing an ASP.NET Core MVC web application.
The web application must support older web browsers and implemented JavaSript features. You must use a polyfill to support the JavaScript Promise object in all browsers.
You need to implement a built-in ASP.NET Core tag Helper to support polyfills.
How should you complete the markup? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
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Suggested Answer:
by markcowell at Oct. 14, 2020, 12:02 a.m.

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markcowell
4 years, 8 months ago
The primary use case for fallbacks in the Script Tag Helper is checking if a CDN is down and loading a local script instead. Another use case is you can use fallbacks to make it easy to polyfill missing JavaScript features in older browsers, while not having your users using the latest browsers take a network hit. <script asp-fallback-test="window.Promise" asp-fallback-src="https://unpkg.com/[email protected]"> </script>
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