[wp-trac] [WordPress Trac] #40191: Multiline post content with `<` as first character becomes malformed

[WordPress Trac]

#40191: Multiline post content with `<` as first character becomes malformed
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 Reporter:  johnjamesjacoby  |       Owner:
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Formatting       |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by soulseekah):

 That is not valid HTML. `<` should be used.

 Related #39153

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Ticket URL: <https://core.trac.wordpress.org/ticket/40191#comment:2>
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