Chemical equation

Only use alt text if the equation is an image. If possible, use a real equation editor (e.g., MathML, Word equation editor). Images—even with alt text—are a fallback, not the best option. Read the equation in logical order, not visually. Describe what happens from left to right using words like reacts with, yields, or forms rather than describing layout. State subscripts, superscripts, and coefficients explicitly. For example: “H two” instead of “H2,” “two H two molecules,” or “squared,” “plus,” “arrow.” Ambiguity is a major barrier for screen reader users. Describe the chemistry, not the formatting. Focus on reactants, products, and conditions—not font size, alignment, or arrows as shapes. Include conditions only if they matter. Temperature, catalysts, charge, or state (aqueous, gas) should be included if they are relevant to meaning.