Sample HTML file: produced with lwarp, with mathematical formulae displayed with MathJax, and xymatrix commutative diagrams displayed with XyJax-v3

5.3 A tikz image compiled to an image with alt text, outside a float environment

(This figure shows a rectangle, whose largest side is horizontal.   Is vertices are labelled 1, 2 (top edge) and 3 and 4.   (bottom edge), from left to right.)