Fix browser support check failure if boot script loaded before body

Fix a false negative in the test for whether the current browser is supported if the Hypothesis boot script is included in the `<head>` of the page (before the `<body>`). In this case `document.body` is `null`.

Fix browser support check failure if boot script loaded before body
Fix a false negative in the test for whether the current browser is supported if the Hypothesis boot script is included in the `<head>` of the page (before the `<body>`). In this case `document.body` is `null`.
3cb74643 · Robert Knight · 9906ff6f · 3cb74643
Commit 3cb74643 authored Oct 30, 2020 by Robert Knight
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browser-check.js src/boot/browser-check.js +1 -1

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--- a/src/boot/browser-check.js
+++ b/src/boot/browser-check.js
@@ -17,7 +17,7 @@ export function isBrowserSupported() {
    // DOM API checks for frequently-used APIs.
    () => new URL(document.location.href), // URL constructor.
    () => new Request('https://hypothes.is'), // Part of the `fetch` API.
-    () => document.body.prepend.name, // Element.prepend() method.
+    () => Element.prototype.prepend.name,

    // DOM API checks for less frequently-used APIs.
    // These are less likely to have been polyfilled by the host page.