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  • Why srcset keeps picking the wrong image

    A srcset with four good widths on it will still fetch the largest one on a phone, and the attribute doing that is not srcset. sizes is the half that decides, it is guessed far more often than it is measured, and its default is the worst value it can hold. (layout, 4 min)

    LoupeKit Blog4 min read
  • What a source map says about the build that shipped it

    A source map is not a leak by itself. It is a decision, and on most sites nobody made it - the bundler defaulted, the flag was never read, and the original source went out with the minified file. (builds, 5 min)

    LoupeKit Blog3 min read
  • Which CSS rule wins, and why it is not the specific one

    Nearly everyone reaches for specificity first, and nearly everyone is starting three steps too late. Specificity is the fourth tie-breaker, and by the time the cascade gets to it most of the interesting decisions have already been made. (css, 4 min)

    LoupeKit Blog4 min read
  • Why your sticky header stops sticking

    position: sticky has no error state. When it does not work it simply behaves as relative - and the cause is usually an ancestor you have never looked at, changed by somebody solving a different problem. (layout, 4 min)

    LoupeKit Blog3 min read
  • Why z-index: 9999 does not put your element on top

    The number is almost never the problem. z-index: 9999 loses to z-index: 2 every day of the week, and it loses for a reason that is nowhere near the element you were editing. (layout, 6 min)

    LoupeKit Blog5 min read
  • What makes a page scroll sideways

    overflow-x: hidden on body is not a fix. It is a way of not knowing which element is forty pixels too wide - and it quietly breaks position: sticky on everything inside it on the way past. (layout, 6 min)

    LoupeKit Blog4 min read
  • Contrast checkers measure a colour you never shipped

    Every contrast checker asks for two colours. A real page hands you one of them at best - the other is a gradient beneath a semi-transparent card above a photograph, and not one of those is a hex value anybody typed. (accessibility, 5 min)

    LoupeKit Blog5 min read
  • The font a page declares is not the font you see

    font-family is a wish list and the browser grants the first wish it can. Nearly every typography bug lives in the gap between the name in the stylesheet and the shapes on the screen. (typography, 6 min)

    LoupeKit Blog4 min read
  • Recovering a Tailwind theme from a site you did not build

    Nobody ships tailwind.config.js. What reaches the browser is a compiled stylesheet and a great many class attributes - and between those two, most of a design system is still legible. (css, 5 min)

    LoupeKit Blog4 min read
  • What a page tells you about how it was built

    Every page announces its own construction, in six different ways, with six different levels of honesty. Knowing which kind of evidence you are looking at matters more than the list of names it produces. (builds, 5 min)

    LoupeKit Blog4 min read
  • Measuring AI-generated markup without guessing

    You cannot detect that code was written by a model. You can measure a texture that generated code tends to have - and then the hard part is not flagging the careful hand-written page that happens to share it. (css, 4 min)

    LoupeKit Blog4 min read
  • Why this extension asks for no website permissions

    Every browser extension you install shows you a list before it runs. Most inspection tools ask for access to all your data on all websites, because it is the easiest thing to ask for. It is also the thing that makes people close the tab. (privacy, 5 min)

    LoupeKit Blog5 min read

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