The power of alt and lang attributes
summary
Research from a Brazilian team uploads three images (bread, clock radio, zoomed photo) to a simple WordPress site, waits two weeks, then adds alt text and reruns checks; results show Google indexes alt but Bing, Yahoo and DuckDuckGo do not, and title attribute is ignored by search engines. Free SEO testers (Site Analyzer and two similar tools) mark missing alt as an issue and show page scores rise when alts are added. Lang usage: set lang on elements (including IMG) for correct screen-reader voice, hyphenation, direction and sign-language semantics; multilingual alts require swapping the single alt via JavaScript.
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