Images shift the layout as they load
32.1%
of the 3,044 free scans considered in the last 30 days raised this finding. That is 976 scans across 969 distinct sites. 95% interval 29.2% to 35.1%.
What it means
Images without reserved dimensions push content around as they arrive, which can make a visitor click the wrong thing.
How to fix it
Add width and height attributes to every img tag, so the browser reserves the right space before the image arrives.
How to check it yourself
View source and check img tags for width and height attributes. Missing attributes mean the browser has no reserved space and content will shift.
What fixed looks like
View source shows width and height attributes on every img tag, and the layout stays still as images load.
How we measured this
Go Voltic scans a site and records which findings it raises. The share above is over every free four-page scan in the last 30 days that loaded at least one page, which is 3,044 scans. Deep scans of paid reports and of the research sweep read a site at a different depth and are a separate population, never in this denominator. It is not a survey and it is not an estimate: it is a count of what our own scanner found. Sites are counted once each in the distinct-sites figure, so a site scanned twice does not weigh double there.
The interval is a 95% Wilson interval. A share printed without its sample size reads as certainty and is indistinguishable from a guess, so both are always shown. Figures on this page were computed on 2026-09-08.
The same share sits beside every other finding on the benchmarks page, which also carries the whole table as CSV and JSON and says how to cite it.
Check your own site
The free scan reads four pages and reports every finding it raises, including this one. It takes about ten seconds and asks for nothing but the address.