"Pretext.js operates in two distinct phases. The prepare() phase uses the Canvas API's measureText() to analyze text and determine the pixel width of every segment independently of the DOM. These results are then cached, and the prepare() cost is paid once."
"When an application needs to calculate the height of text, it traditionally queries the DOM using commands like getBoundingClientRect or offsetHeight, triggering a layout reflow that can lead to frame drops and sluggish interfaces."
Pretext is a 15KB open-source TypeScript library designed to measure and layout text without interacting with the DOM, avoiding costly browser layout reflows. This enables advanced UI/UX patterns to operate smoothly at high frame rates. Traditional methods of calculating text height trigger layout reflows, leading to performance issues. Pretext uses the Canvas API to measure text dimensions and caches results, allowing for efficient layout calculations without reflow, thus improving user experience in applications that require complex layouts.
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