title

class Title(Component):
    """The page's ``<title>``: the browser tab, the index card, the link card.

    It renders nothing into the body. Derive it from the data rather than
    repeating the function's name.

    ```python
    cg.ui.Title(f"Session {session.captured.date().isoformat()}")
    ```
    """

    text: str

    def __post_init__(self) -> None:
        """Check the prop and set the title of the page being built.

        Raises:
            RuntimeError: If no ``PageBuilder`` function is running.
        """
        super().__post_init__()
        Build.current().title = self.text

    def html(self, render: Render) -> str:
        """Nothing; the title lives in the document head."""
        return ""