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@paulirish
paulirish / what-forces-layout.md
Last active July 3, 2024 16:54
What forces layout/reflow. The comprehensive list.

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
@weipah
weipah / import-portatour.ps1
Last active March 4, 2024 22:34
PowerShell V3 Multipart/formdata example with REST-API (Invoke-RestMethod)
function Import-Portatour {
param (
[parameter(Mandatory=$True,Position=1)] [ValidateScript({ Test-Path -PathType Leaf $_ })] [String] $FilePath,
[parameter(Mandatory=$False,Position=2)] [System.URI] $ResultURL
)
# CONST
$CODEPAGE = "iso-8859-1" # alternatives are ASCII, UTF-8
# We have a REST-Endpoint
$RESTURL = "https://my.portatour.net/a/api/ImportCustomers/"