Before reporting a bug

• Check common issues.
• Check the bug is reproducible in the demo. If not, check KaTeX is up-to-date and installed correctly.
• Search for existing issues.

Describe the bug:

The MathML span's position seems weird in our Markdown editor component.

Demo here

(La)TeX code:
The code of (La)TeX you tried to render:

\displaystyle \left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)

Screenshots:

Environment (please complete the following information):

• KaTeX Version: v0.12.0
• Device: Desktop
• OS: macOS big sur
• Browser: Chrome
• Version: 88.0.4324.182