Target=_blank implies rel=noopener
If you want to be a good web citizen, you might be aware of the target="_blank" security issue. In the old days, when you linked to a site and wanted to open a new tab with target="_blank", the target site could access your site via window.opener. This means in short: If window A opens window B, B.opener returns A. If you haven't heard of this behavior, it's pretty wild because it implies that tar
Safe/unsafe alignment in CSS flexbox
This post is part of my Today I learned series in which I share all my web development learnings. I recently watched the talk "Making Things Better: Redefining the Technical Possibilities of CSS" by Rachel Andrews. The talk included one line of CSS that I haven't seen before. .something { display: flex; // what's that?👇 😲 align-items: safe center; } Rachel explains that when the CSS specs are wr
A Firefox-only minimap | Stefan Judis Web Development
Greetings! 👋 If you discovered this page, you're part of the few Firefox desktop users out there (market share is only 4% right now) and wondered how my blog posts' minimaps are made. If you're not using Firefox, this is how the minimap looks like. Firefox is the only browser that supports the fancy element() CSS function (with a vendor prefix, but hey 🤷♂️). The function allows you to display i
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Safari 18 — what web features are usable across browsers?
Investigating INP issues
Should responsive images work with container queries?
