YAML parser doesn't recognize flow-style multi-line strings

[natronium]

This is valid YAML/KSY that contains a flow-folded string^[1][2][3].

meta:
  id: example
  file-extension: example
seq:
  - id: stringdemo
    size: 0
    doc: This is a flow-style
      multi-line string

But causes the web IDE's YAML parser to throw a ParseException:
YAML parsing error: <ParseException> Unable to parse. (line 8: ' multi-line string')

Quoting the string (with ' or ") causes the parser to throw this exception instead:
YAML parsing error: <ParseException> Malformed inline YAML string ('This is a flow-style). (line 7: 'doc: 'This is a flow-style ')

1. Flow folding from official spec
2. Flow-style strings from official spec
3. Some friendlier unofficial YAML docs (The list in the second half of the 'Scalars' section in particular)