fix(html): trim the first empty line in <pre> tag
#90
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Description
trim the first empty line in
<pre>tagMotivation
The adding of
<code>tag makes the first empty line would not be ignored by User Agent, see the spec. Ref: mdn/yari#12364 (comment)So trimming the first empty line in
<pre>tag to simulate the semantics.Related issues and pull requests
Fixes: mdn/yari#12364
Test: check the rendered html in
/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_action:Before:
After: