Puppeteer Painting
Calculate a Page's First Paint Time with Puppeteer. In this lesson we are going to use the firstPaintTime metric from chrome's load times, as well as the navigation start from the W3C window metrics, to calculate how long it takes a page to paint. We will set up a quick function and test it out. A puppet is an object, often resembling a human, animal or mythical figure, that is animated or manipulated by a person called a Puppeteer.The Puppeteer uses movements of his hands, arms, or control devices such as rods or strings to move the body, head, limbs, and in some cases the mouth and eyes of the puppet.
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Comments
commented Feb 10, 2019
In the chrome devtool, there is an option in 'rendering' called 'paint flashing', once enabled it allows you to see the area that is painted with highlighted greenbox. Is it possible to expose the painted area/dom/element via puppeteer as frame/page event? it would be very useful for analysing the performance and remotely syncing the graphic. |
commented Feb 10, 2019 •
After some investigations, it turns out chrome devtool protocol doesn't expose the detailed information about which dom element triggers the paint (all it requires to highlight the painting area is a call to Trace.setShowPaint, the highlighting is done in chrome side, with no detailed info be sent to inspector). So i guess there isn't much can be done by puppeteer here. |