Syntax highlighting glitch

Long lines can sometimes confuse the parser:

{{#if active}}<span>{{else}}<a {{#if id}}id="{{id}}"{{/if}} href="{{{url}}}">{{/if}}{{#if img}}<img class="desaturate" id="{{img.id}}" src="{{img.src}}" alt="{{img.alt}}" width="{{img.width}}" height="{{img.height}}" />{{/if}}{{name}}{{#if active}}</span>{{else}}</a>{{/if}}

The img closing bracket /> is where highlighting messes up and mistakenly highlights that and the rest of the line as HTML attribute color.

Whereas GitHub's own syntax highlighting correctly highlights the whole line!

Use the Handlebars template in the issue as the reproduction case and inspect the syntax-highlighting grammar or parser entry point that handles nested tags and long lines. Compare its output with GitHub's highlighting; done when the img closing bracket and the remainder of the line are no longer incorrectly colored as HTML attributes.