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Animating qualities which cause designs around the DOM will trigger a layout on every frame. Within the glides I’ve place in some good examples of bad practise where I naively do css animator around the width property.

The treatment for the very first situation is commonly quite simple: batch your reads and write altogether. Don’t change a house then immediately see clearly. E.g.Don’t append for an innerhtml inside a loop Rather combine it with another string increase the innerHTML all at once.

Within an mvc or perhaps a large framework with lots of independent modules it can be hard to make sure modules don’t interleave read and creates. Wilson Page’s fastdom library can sort out this to ensure that reads and creates in one frame all have completed together.

A great general motto would be to calculate all DOM changes first then apply these questions single step.

Animating an interaction which in turn causes lots of switch to design.

Your house there exists a widget by which notices get appended. (Slide showing the notification example) Like a new element will get added the widget develops tall.


You want to animate prepending a component towards the start. Here there’s an issue since the height changes which pushes many elements round the page, so it’s costly because it’s a layout operation and far worse since the whole page can change so layout must be carried out around the entire document.

But following our recommendation from earlier before we insert the brand new notification we are able to measure how everything can change then animate that change. (Click two times to demo the graceful interaction)

When you are performing something similar to this animator is advisable to front load all the dom read/creates therefore the application is responsive because the animation finishes.

If carrying out a DOM change on the user interaction then you’ve in regards to a whole 100ms (~6 frames) to determine and email the DOM before it feels sluggish. That is sufficient time to do these dimensions. This process follows up from the great talk provided by Paul Lewis (@aerotwist) in the Chrome Dev Summit.

(Next example within the glides follows this through step-by-step)

This follow-up publish adopts more detail because this doesn’t work that well in most situations. That publish fixes a problem with animating nested scale transforms with css transitions.

In a nutshell Body should rather make use of a library like tween.js to change the kids to achieve the inverse proportions of parents.

Measure every element you want to animate.

Keep current animation so it may be restored later place it to ‘0s’

Keep current transform so it may be restored later

Carry out the function

Appraise the new positions, dimensions,

Anything that has altered size: scale it and all sorts of give all its children the inverse transform.

Give all of the children the offset from the top left from the parent

Provide them with the inverse scale

Use the translations to maneuver something to its new place

Use the new transition to everything affected

Set all the transforms for their original values

Watch everything easily animate.

On transitionend

Restore the transitions

Fire any callbacks


Ada Rose Edwards