CSS3 Transitions support in Opera Presto 2.7

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CSS3 Transitions Module

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CSS3 transitions and 2D transforms

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Transition properties support

Transition events support

Animation of property types support

Opera Presto offers partial support for the CSS3 Transitions module. CSS3 Transitions enable implicit transitions, which allow CSS properties to change smoothly from one value to another over a given duration. Normally when the value of a CSS property changes, the rendered result is instantly updated, with the affected elements immediately changing from the old property value to the new property value. CSS3 Transitions provide a way to specify transitions using new CSS properties. These properties are used to animate smoothly from the old state to the new state over time.

Transition properties support

Opera Presto supports the following CSS3 Transition properties prefixed with "-o-".

-o-transition-property property

This property specifies the name of the CSS property to which the transition is applied. A value of "none" means that no property will transition. A value of "all" means that every property that is able to undergo a transition will do so. Otherwise, a list of properties to be transitioned is given.

-o-transition-property support data

Property name	-o-transition-property
Value(s)	none | all | [ <IDENT> ] | [ "," <IDENT> ]*
Initial	all
Applies to	block-level and inline-level elements
Inherited	no
Percentages	n/a
Media	visual
Computed value	same as specified value
Support	Partial: see Animation of property types support

-o-transition-duration property

This property defines the length of time that a transition takes. It specifies how long the transition from the old value to the new value should take. By default the value is ‘0’, meaning that the transition is immediate (i.e. there will be no animation). A negative value for transition-duration is treated as ‘0’.

-o-transition-duration support data

Property name	-o-transition-duration
Value(s)	<time> [, <time>]*
Initial	0
Applies to	block-level and inline-level elements
Inherited	no
Percentages	n/a
Media	visual
Computed value	same as specified value
Support	Partial: see Animation of property types support

-o-transition-timing-function property

This property describes how the intermediate values used during a transition will be calculated. It allows for a transition to change speed over its duration. These effects are commonly called easing functions. In either case, a mathematical function that provides a smooth curve is used.

The timing function is specified using a cubic bezier curve, which is defined by four control points, P0 through P3. P0 and P3 are always set to (0,0) and (1,1). The -o-transition-timing-function property is used to specify the values for points P1 and P2. These can be set to preset values using the keywords listed below, or can be set to specific values using the "cubic-bezier" function. In the "cubic-bezier" function, P1 and P2 are each specified by both an X and Y value. The timing function takes as its input the current elapsed percentage of the transition duration and outputs a percentage that determines how close the transition is to its goal state.

Timing function value definitions:

ease

The ease function is equivalent to cubic-bezier(0.25, 0.1, 0.25, 1.0).

linear

The linear function is equivalent to cubic-bezier(0.0, 0.0, 1.0, 1.0).

ease-in

The ease-in function is equivalent to cubic-bezier(0.42, 0, 1.0, 1.0).

ease-out

The ease-out function is equivalent to cubic-bezier(0, 0, 0.58, 1.0).

ease-in-out

The ease-in-out function is equivalent to cubic-bezier(0.42, 0, 0.58, 1.0).

cubic-bezier

Specifies a cubic-bezier curve.

• The four values specify points P₁ and P₂ of the curve as (x1, y1, x2, y2).
• All values must be in the range [0, 1] or the definition is invalid.

-o-transition-timing-function support data

Property name	-o-transition-timing-function
Value(s)	ease | linear | ease-in | ease-out | ease-in-out | cubic-bezier(<number>, <number>, <number>, <number>) [, ease | linear | ease-in | ease-out | ease-in-out | cubic-bezier(<number>, <number>, <number>, <number>)]*
Initial	ease
Applies to	block-level and inline-level elements
Inherited	no
Percentages	n/a
Media	visual
Computed value	same as specified value
Support	Partial: see Animation of property types support

-o-transition-delay property

This property defines when the transition will start. It allows a transition to begin execution some some period of time from when it is applied. A -o-transition-delay value of "0" means the transition will execute as soon as the property is changed. Otherwise, the value specifies an offset from the moment the property is changed, and the transition will delay execution by that offset.

If the value for -o-transition-delay is a negative time offset then the transition will execute the moment the property is changed, but will appear to have begun execution at the specified offset. That is, the transition will appear to begin part-way through its play cycle. In the case where a transition has implied starting values and a negative -o-transition-delay, the starting values are taken from the moment the property is changed.

-o-transition-delay support data

Property name	-o-transition-delay
Value(s)	<time> [, <time>]*
Initial	0
Applies to	block-level and inline-level elements
Inherited	no
Percentages	n/a
Media	visual
Computed value	same as specified value
Support	Partial: see Animation of property types support

-o-transition shorthand property

This shorthand property combines the four properties described above into a single property.

-o-transition shorthand support data

Property name	-o-transition (shorthand)
Value(s)	[<-o-transition-property> || <-o-transition-duration> || <-o-transition-timing-function> || <-o-transition-delay> [, [<-o-transition-property> || <-o-transition-duration> || <-o-transition-timing-function> || <-o-transition-delay>]]*
Initial	see individual properties
Applies to	block-level and inline-level elements
Inherited	no
Percentages	n/a
Media	visual
Computed value	same as specified value
Support	Partial: see Animation of property types support

Transition events support

The completion of a CSS3 Transition generates a corresponding DOM Event. An event is fired for each property that undergoes a transition. This allows a content developer to perform actions that synchronize with the completion of a transition. Each event provides the name of the property the transition is associated with as well as the duration of the transition.

Interface OTransitionEvent

This interface provides specific contextual information associated with transitions.

IDL Definition

interface OTransitionEvent : Event {
    readonly attribute DOMString          propertyName;
    readonly attribute float              elapsedTime;
    void               initTransitionEvent(in DOMString typeArg,
                                          in boolean canBubbleArg,
                                          in boolean cancelableArg,
                                          in DOMString propertyNameArg,
                                          in float elapsedTimeArg);
  };

Attributes

Attribute	Description	Support
propertyName of type DOMString, readonly	The name of the CSS property associated with the transition.	Partial: see Animation of property types support
elapsedTime of type float, readonly	The amount of time the transition has been running, in seconds, when this event fired. Note that this value is not affected by the value of transition-delay.	Partial: see Animation of property types support

Methods

initTransitionEvent

This method is used to initialize the value of a OTransitionEvent created through the DocumentEvent interface. This method may only be called before the OTransitionEvent has been dispatched via the dispatchEvent method, though it may be called multiple times during that phase if necessary. If called multiple times, the final invocation takes precedence.

Parameters

Parameter	Description	Support
typeArg of type DOMString	Specifies the event type.	Yes
canBubbleArg of type boolean	Specifies whether or not the event can bubble.	Yes
cancelableArg of type boolean	Specifies whether or not the event's default action can be prevented.	Yes
propertyNameArg of type DOMString	Specifies the name of the property associated with the Event.	Yes
elapsedTimeArg of type float	Specifies the amount of time, in seconds, the transition has been running at the time of initialization.	Yes
No Return Value | No Exceptions

There is one type of transition event available.

Event	Description	Support
oTransitionEnd	The oTransitionEnd event occurs at the completion of the transition. Bubbles: Yes Cancelable: Yes Context Info: propertyName	Yes

Animation of property types support

The following list defines how each property type undergoes transition or animation.

color

Interpolated via red, green, blue and alpha components (treating each as a number, see below).

length

Interpolated as real numbers.

percentage

Interpolated as real numbers.

integer

Interpolated via discrete steps (whole numbers); the interpolation happens in real number space and is converted to an integer using floor().

number

Interpolated as real (floating point) numbers.

transform list

See the CSS Transforms specification.

rectangle

Interpolated via the x, y, width and height components (treating each as a number).

visibility

Interpolated via a discrete step; the interpolation happens in real number space between 0 and 1, where 1 is "visible" and all other values are "hidden".

shadow

Interpolated via the color, x, y and blur components (treating them as color and numbers where appropriate).

gradient

Interpolated via the positions and colors of each stop; they must have the same type (radial or linear) and same number of stops in order to be animated.

paint server (SVG)

Note: Opera does not yet support paint server (SVG)

Interpolation is only available between:

• gradient to gradient
• color to color

They then work as described above.

space-separated list of above

Each item in the list is interpolated using the rules above.

Animatable properties

Opera Presto offers partial support for animation properties as identified in the following table.

CSS animation properties support

Property Name	Type	Support
background-color	color	Yes
background-image	only gradients	No
background-position	percentage, length	No
border-bottom-color	color	No
border-bottom-width	length	Yes
border-color	color	No
border-left-color	color	No
border-left-width	length	Yes
border-right-color	color	No
border-right-width	length	Yes
border-spacing	length	Yes
border-top-color	color	No
border-top-width	length	Yes
border-width	length	Yes
bottom	length, percentage	Yes
color	color	Yes
crop	rectangle	No
font-size	length, percentage	Yes
font-weight	number	Yes
grid-*	various	No
height	length, percentage	Yes
left	length, percentage	Yes
letter-spacing	length	Yes
line-height	number, length, percentage	Yes
margin-bottom	length	Yes
margin-left	length	Yes
margin-right	length	Yes
margin-top	length	Yes
max-height	length, percentage	Yes
max-width	length, percentage	Yes
min-height	length, percentage	Yes
min-width	length, percentage	Yes
opacity	number	Yes
outline-color	color	Yes
outline-offset	integer	Yes
outline-width	length	Yes
padding-bottom	length	Yes
padding-left	length	Yes
padding-right	length	Yes
padding-top	length	Yes
right	length, percentage	Yes
text-indent	length, percentage	Yes
text-shadow	shadow	No
top	length, percentage	Yes
vertical-align	keywords, length, percentage	Yes
visibility	visibility	Yes
width	length, percentage	Yes
word-spacing	length, percentage	Yes
z-index	integer	Yes
zoom	number	No

SVG properties

For your guide, Opera Presto currently does not support SVG properties in CSS3 Transitions.

SVG properties

Property Name	Type	Support
stop-color	color	No
stop-opacity	float	No
fill	paint server	No
fill-opacity	float	No
stroke	paint server	No
stroke-dasharray	list of numbers	No
stroke-dashoffset	number	No
stroke-miterlimit	number	No
stroke-opacity	float	No
stroke-width	float	No
viewport-fill	color	No
viewport-fill-opacity	color	No