But it makes sense because Google clearly understands the relationships between product names and serial/product numbers. Google has no official guidelines stating that you should do this. For these, it can be useful to add the product or serial number, like so: You may wish to deviate from this formula slightly when writing alt text for product images. “This is a drawing of my cat, Mark, playing with his toys.“ “This is a photograph of a chocolate cheesecake.“ Remove any conjunctions or connections (e.g., a/an) from the resulting sentence and use the last part as your alt text. “This is a(n) image/screenshot/photograph/drawing of _.” However, here’s a shortcut that almost always works perfectly-finish this sentence: Matt Cutts gives some equally good advice for alt text in this old, yet still relevant video: Avoid filling alt attributes with keywords (keyword stuffing) as it results in a negative user experience and may cause your site to be seen as spam. When choosing alt text, focus on creating useful, information-rich content that uses keywords appropriately and is in context of the content of the page. Google uses alt text along with computer vision algorithms and the contents of the page to understand the subject matter of the image. Here’s their general advice for writing these: It’s used to show what a well-written alt tag looks like. That example comes straight from Google’s official guidelines. Browsers also display alt text if there’s a problem rendering images. Alt text (alternative text) describes an image. It’s what the browser displays to users with screen readers.
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