Module latex 

LaTeX formula extraction module (R1).

Extracts LaTeX formulas from HTML content, handling multiple sources:

• Habr: img.formula elements with source attribute
• KaTeX: .katex elements with annotation[encoding="application/x-tex"]
• MathJax: mjx-container elements with data-tex/data-latex attributes

Based on reference implementation from: https://github.com/link-foundation/meta-theory/blob/main/scripts/download-article.mjs

Functions

extract_formula

Extract formula from any supported element type.

extract_habr_formula

Extract LaTeX source from a formula image element (Habr-specific).

extract_katex_formula

Extract LaTeX from KaTeX elements.

extract_mathjax_formula

Extract LaTeX from MathJax elements.

is_formula_image

Check if an element is a formula image (Habr-specific).

is_math_element

Check if an element is a math element (KaTeX, MathJax, or generic math class).