Retrouvez une sélection de liens sur le thème des performances Web de la semaine passée. Au sommaire, 11 liens sur : CSSitis, brotli, Services Workers, Chrome reloads, AMP et votre site au régime.
Au sommaire, 23 liens sur : Arcep, Awwwards, scripts JS, DDoS et émotions, WebPageTest, FB Live, brotli et Varnish, métadonnées XML et images, 3rd party scripts, Offline First, WordPress to Hugo, Canonical AMP, démarrer en webperf, perf-tool
"I did some research about how images are downloaded when media queries are involved. I wrote up some automated tests where Javascript could determine whether or not the image was requested. I've got enough data now to be able to go into detailed findings."
"ScriptPNG is a PNG optimizer for Windows 32 bits. It reduces files size by parallel processing, with differents levels of compression. It converts GIF, BMP, JPG, PCX, or TGA to PNG.
ScriptJPG is a JPG optimizer for Windows 32 bits. It reduces files size with a lossless process or with differents lossy methods - those methods also reduce image quality."
Summary: Learn how to simulate the elimination of JavaScript with Web Page Test. By eliminating, deferring or converting your JavaScript behavior into CSS you can speed up your page rendering and load times.
Une nouvelle technique pour masquer du contenu sans utiliser le fameux `left: -9999px`.
Principal avantage : le navigateur n'a pas besoin de dessiner une boîte énorme pour y placer ce contenu.