Study finds accessibility overlay widgets make no measurable change to Shopify store markup

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A developer tested accessibility overlay widgets on 56 Shopify stores by measuring the same pages twice — once with the overlay script loading and once with it blocked — using axe-core to count accessibility violations. The paired methodology kept all variables constant, making each store its own control and eliminating selection bias. Across six runs and three separate samples, the median change to underlying page markup was zero in every case. An earlier cross-sectional comparison had found stores with overlays carried 78.6% more violation nodes than those without, but the author discarded that finding as uninterpretable due to self-selection bias. The study does not assess whether overlay toolbar features benefit users, only whether the scripts alter a page's accessibility markup.

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