Properly escape &
in injected live-reload script tag
#825
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Unescaped Ampersands used as query string separators in an URL must be escaped when that URL is used as value for an HTML (or XML, for that matter) attribute.
From: https://en.wikipedia.org/wiki/HTML#Character_and_entity_references
And here's a screenshot (as seen in #824) in which the red coloring added by Firefox's source code viewer indicates an issue with the markup: