\environment math-fonts-helpers

\startbuffer[scripts]
    \ruledhbox{$\textstyle         \char"221A \sqrt{x} \sqrt[3]{x} \sqrt{\frac{1}{x}}$}
    \blank
    \ruledhbox{$\scriptstyle       \char"221A \sqrt{x} \sqrt[3]{x} \sqrt{\frac{1}{x}}$}
    \blank
    \ruledhbox{$\scriptscriptstyle \char"221A \sqrt{x} \sqrt[3]{x} \sqrt{\frac{1}{x}}$}
\stopbuffer

\starttext

    \MathSamples [
    ] [
        scripts
    ]

\stoptext