function tokenizeBlockQuoteContinuation(effects, ok, nok) {
  const self = this

  return contStart

  /**
   * Start of block quote continuation.
   *
   * Also used to parse the first block quote opening.
   *
   * ```markdown
   *   | > a
   * > | > b
   *     ^
   * ```
   *
   * @type {State}
   */
  function contStart(code) {
    if (markdownSpace(code)) {
      // Always populated by defaults.
      assert(
        self.parser.constructs.disable.null,
        'expected `disable.null` to be populated'
      )

      return factorySpace(
        effects,
        contBefore,
        types.linePrefix,
        self.parser.constructs.disable.null.includes('codeIndented')
          ? undefined
          : constants.tabSize
      )(code)
    }

    return contBefore(code)
  }

  /**
   * At `>`, after optional whitespace.
   *
   * Also used to parse the first block quote opening.
   *
   * ```markdown
   *   | > a
   * > | > b
   *     ^
   * ```
   *
   * @type {State}
   */
  function contBefore(code) {
    return effects.attempt(blockQuote, ok, nok)(code)
  }
}
Start of block quote continuation.

```markdown
  | > a
> | > b
    ^
```

@this {TokenizeContext}
  Context.
@type {Tokenizer}