The switch statement evaluates an expression, matching the expression's value against a series of case clauses, and executes statements after the first case clause with a matching value, until a break statement is encountered. The default clause of a switch statement will be jumped to if no case matches the expression's value....in globalThis) { // Fetch a resource with fetch } else if ("XMLHttpRequest"...in globalThis) { // Fetch a resource with XMLHttpRequest } else...