Matthew Griffith mdgriffith

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

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Try elm-search to see what this is all about.

An API search engine in Elm for Elm

Elm is a statically typed functional language that compiles to JavaScript. It's well-known for its developer experience: the compiler provides nice error messages, the package system enforces semantic versioning for all published packages and makes sure every exposed value or type has some documentation and type annotations.

	#
	# Copyright (C) 2013-2020 Vinay Sajip. New BSD License.
	#
	import os
	import os.path
	from subprocess import Popen, PIPE
	import sys
	from threading import Thread
	from urllib.parse import urlparse
	from urllib.request import urlretrieve

	data Alert = MSuccess \| MWarning \| MInfo
	deriving (Eq, Enum, Bounded, Show)

	mkToCls :: Alert -> Text
	mkToCls MSuccess = "alert-success"
	mkToCls MWarning = "alert-warning"
	mkToCls MInfo = "alert-info"

	class (Enum a, Bounded a, Show a) => MessageKey a