Notes
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Structured data does not rank you It makes a page eligible for a richer result. Eligibility is not a promise, and two of the popular types stopped being shown at all. What a diff actually computes It finds the longest sequence of lines the two versions share. Everything else is reported as inserted or deleted, including moves. Five fields and a schedule Minute, hour, day, month, weekday. The two day fields combine with OR, not AND, which is the trap in the whole notation. A life expectancy figure is a population average Smoking dominates every other modifiable factor. Everything else on the list is a rounding error next to it. Ten digits or thirteen: which timestamp is that A date in 1970 means you divided when you should have multiplied. Counting the digits tells you the unit, and the leading value tells you the epoch. The last digit of a barcode is doing the checking Twelve digits carry the number and the thirteenth proves it was read correctly. Get it wrong and every scanner rejects the code. A QR code is text with error correction There is no lookup and no database. Everything the code does is written into the pattern, which is why a shorter link scans better. Marketplace image rules are zoom rules The minimum pixel size is not a quality preference. Fall below it and the zoom feature switches off for your listing. Your star sign moved, and nobody updated the dates The tropical zodiac is fixed to the seasons. The constellations behind it have drifted a full sign since the dates were set. How many icon sizes do you actually need The lists run to twenty files. Four cover almost every case, and one of them can be a single scalable file. What a link preview actually reads Five tags in the page head decide how your URL looks when someone pastes it. Miss the image and the platform picks one for you. Five ad sizes carry most of the inventory The medium rectangle and the leaderboard have outlived every redesign of the web, because publishers built their layouts around them.
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