div

id

string

-

No

Unique ID of a component.

style

string

-

No

Style declaration of a component.

class

string

-

No

Style class of a component, which is used to refer to a style table.

ref

string

-

No

Used to register reference information of child elements or child components. The reference information is registered with the parent component on $refs.

disabled

boolean

false

No

Whether a component is disabled. If it is disabled, it cannot respond to user interaction.

data

string

-

No

Attribute set for a component to facilitate data storage and reading.

touchstart

TouchEvent

The tapping starts

touchmove

TouchEvent

The tapping moves

touchcancel

TouchEvent

The tapping is interrupted

touchend

TouchEvent

The tapping ends

click

-

A component is clicked

longpress

-

A component is long pressed

swipe⁵⁺

SwipeEvent

A user quickly swipes on a component.

flex-direction

string

row

No

Main axis direction of the flex container. Available values are as follows:

• column: Items are placed vertically from top to bottom.
• row: Items are placed horizontally from left to right.

flex-wrap

string

nowrap

No

Whether flex items in the container are displayed in a single line or multiple lines. Currently, dynamic modification is not supported. Available values are as follows:

• nowrap: Items are displayed on a single axis.
• wrap: Items are displayed on multiple axes.

justify-content

string

flex-start

No

How items are aligned along the main axis of the current line in a flex container. Available values are as follows:

• flex-start: Items are packed towards the start line.
• flex-end: Items are packed towards the end line.
• center: Items are centered along the line.
• space-between: Items are positioned with space between the lines.
• space-around: Items are positioned with space before, between, and after the lines.
• space-evenly⁵⁺: Items are arranged with even space between each two.

align-items

string

stretch

No

How items are aligned along the cross axis of the current line in a flex container. Available values are as follows:

• stretch: Items are stretched to the same height or width as the container in the cross axis direction.
• flex-start: Items are aligned to the start of the cross axis.
• flex-end: Items are aligned to the end of the cross axis.
• center: Items are aligned in the middle of the cross axis.

align-content

string

flex-start

No

Multi-line alignment mode when there is extra space in the cross axis. Available values are as follows:

• flex-start: All lines are packed towards the start of the cross axis. The start edge of the cross axis of the first line is aligned with the start edge of the cross axis of the container. All subsequent lines are aligned with the previous line.
• flex-end: All lines are packed towards the end of the cross axis. The end of the cross axis of the last line is aligned with the end of the cross axis of the container. All subsequent lines are aligned with the previous line.
• center: All lines are packed towards the center of the container. Lines are close to each other and aligned with the center of the container. The spacing between the start of the container's cross axis and the first line is equal to the spacing between the end of the container's cross axis and the last line.
• space-between: All lines are evenly distributed in the container. The spacing between two adjacent lines is the same. The start and end edges of the container's cross axis are aligned with the edges of the first and last lines, respectively.
• space-around: All lines are evenly distributed in the container, and the spacing between two adjacent lines is the same. The spacing between the start edge of the container's cross axis and the first line and that between the end edge and the last line are half of the spacing between two adjacent lines.

display

string

flex

No

Type of the view box of the element. Currently, dynamic modification is not supported. Available values are as follows:

• flex: flexible layout
• grid: grid layout
• none: This item is not rendered.

grid-template-[columns|rows]

string

1 row, 1 column

No

Number of rows and columns in the current grid layout. If this attribute is not set, one row and one column are displayed by default. This attribute is valid only when display is set to grid.

For example, set grid-template-columns to:

• 50px 100px 60px: There are three columns. The first column is 50 px, the second column is 100 px, and the third column is 60 px.
• 1fr 1fr 2fr: There are three columns, and the width allowed by the parent component is divided into four equal shares. The first column occupies one share, the second column occupies one share, and the third column occupies two shares.
• 30% 20% 50%: There are three columns. The first column occupies 30% of the total width allowed by the parent component, the second column occupies 20%, and the third column occupies 50%.
• repeat (2,100px): There are two columns. The first column is 100 px, and the second column is 100 px.
• repeat(auto-fill,100px)⁵⁺: Each column is 100 px and repeats to fill the cross axis. The number of columns is calculated based on the column size and the cross axis size.
• auto 1fr 1fr: There are three columns. The first column is adaptive to the width required by its child components. The remaining space is divided into two equal shares, one share occupied by each of the rest two columns.

grid-[columns|rows]-gap

<length>

0

No

Size of the gap between two consecutive rows or columns in a grid layout. You can also use grid-gap to set the same size of the gap between rows and columns. This attribute is valid only when display is set to grid.

grid-row-[start|end]

number

-

No

Start and end row numbers of the current item in the grid layout. This attribute is valid only when display of the parent component is grid. (The display attribute of the parent component can be set to grid only for the <div> container.)

grid-column-[start|end]

number

-

No

Start and end column numbers of the current item in the grid layout. This attribute is valid only when display of the parent component is grid. (The display attribute of the parent component can be set to grid only for the <div> container.)

grid-auto-flow⁵⁺

string

-

No

Using an algorithm to lay out the grid automatically. Available values are as follows:

• row: Elements are filled row by row. When there is no horizontal space in a row, a new row is added.
• column: Elements are filled column by column. When there is no vertical space in a column, a new column is added.

width

<length> | <percentage>

-

No

Component width.

If this attribute is not set, the width required for the element content is used.

height

<length> | <percentage>

-

No

Component height.

If this length attribute is not set, the length required for the element content is used.

padding

<length> | <percentage>⁵⁺

0

No

Shorthand attribute to set all padding attributes.

padding-[left|top|right|bottom]

<length> | <percentage>⁵⁺

0

No

Left, top, right, and bottom padding (in px).

padding-[start|end]

<length> | <percentage>⁵⁺

0

No

Start and end padding.

margin

<length> | <percentage>⁵⁺

0

No

Shorthand attribute to set margins for all sides in a declaration. The attribute can have one to four values:

• If you set only one value, it specifies the margin for all the four sides.

• If you set two values, the first value is for the top and bottom sides and the second value for the left and right sides.

• If you set three values, the first value is for the top, the second value for the left and right, and the third value for the bottom.

• If you set four values, they are margins for top, right, bottom, and left sides, respectively.

margin-[left|top|right|bottom]

<length> | <percentage>⁵⁺

0

No

Left, top, right, and bottom margins.

margin-[start|end]

<length> | <percentage>⁵⁺

0

No

Start and end margins.

border

-

0

No

Shorthand attribute to set all borders. You can set border-width, border-style, and border-color in sequence. Default values are used for attributes that are not set.

border-style

string

solid

No

Shorthand attribute to set the style for all borders. Available values are as follows:

• dotted: Dotted border. The radius of a dot is half of border-width.
• dashed: Dashed border

• solid: Solid border

border-[left|top|right|bottom]-style

string

solid

No

Styles of the left, top, right, and bottom borders. The available values are dotted, dashed, and solid.

border-[left|top|right|bottom]

-

-

No

Shorthand attribute to set the borders for every side respectively. You can set border-width, border-style, and border-color in sequence. Default values are used for attributes that are not set.

border-width

<length>

0

No

Shorthand attribute to set the width of all borders, or separately set the width of each border.

border-[left|top|right|bottom]-width

<length>

0

No

Attribute to set widths of left, top, right, and bottom borders.

border-color

<color>

black

No

Shorthand attribute to set the color of all borders, or separately set the color of each border.

border-[left|top|right|bottom]-color

<color>

black

No

Attribute to set colors of left, top, right, and bottom borders.

border-radius

<length>

-

No

Attribute to set the radius of round borders of an element. This attribute cannot be used to set the width, color, or style of a specific border. To set the width or color, you need to set border-width, border-color, or border-style for all the borders at the same time.

border-[top|bottom]-[left|right]-radius

<length>

-

No

Attribute to receptively set the radii of upper-left, upper-right, lower-right, and lower-left rounded corners

background

<linear-gradient>

-

No

This attribute supports Gradient Styles only but is not compatible with background-color or background-image.

background-color

<color>

-

No

Background color.

background-image

string

-

No

Background image. Currently, this attribute is not compatible with background-color or background. Local image resources are supported.

Example:

background-image: url("/common/background.png")

background-size

• string
• <length> <length>
• <percentage> <percentage>

auto

No

Background image size.

• The string values are as follows:
  • contain: Expands the image to the maximum size so that the height and width of the image are applicable to the content area.
  • cover: Extends the background image to a large enough size so that the background image completely covers the background area. Some parts of the image may not be displayed in the background area.
  • auto: The original image width-height ratio is retained.
• The two <length> values are as follows:

  Width and height of the background image. The first value indicates the width, and the second value indicates the height. If you only set one value, the other value is set to auto by default.

• The two <percentage> values are as follows:

  Width and height of the background image in percentage of the parent element. The first value indicates the width, and the second value indicates the height. If you only set one value, the other value is set to auto by default.

background-repeat

string

repeat

No

How a background image is repeatedly drawn. By default, a background image is repeated both horizontally and vertically.

• repeat: Repeatedly draws images along the x-axis and y-axis at the same time.
• repeat-x: Repeatedly draws images along the x-axis.
• repeat-y: Repeatedly draws images along the y-axis.
• no-repeat: The image is not drawn repeatedly.

background-position

• string string
• <length> <length>
• <percentage> <percentage>

0px 0px

No

• Using keywords: If only one keyword is specified, the other value is center by default. The two values define the horizontal position and vertical position, respectively.
  • left: leftmost in the horizontal direction
  • right: rightmost in the horizontal direction
  • top: top in the vertical direction
  • bottom: bottom in the vertical direction
  • center: center position

• Using <length>: The first value indicates the horizontal position, and the second value indicates the vertical position. 0 0 indicates the upper left corner. The unit is pixel. If only one value is specified, the other one is 50%.
• Using <percentage>: The first value indicates the horizontal position, and the second value indicates the vertical position. 0% 0% indicates the upper left corner. 100% 100% indicates the lower right corner. If only one value is specified, the other one is 50%.
• Using both <percentage> and <length>.

opacity

number

1

No

Transparency of an element. The value ranges from 0 to 1. The value 1 means opaque, and 0 means completely transparent.

visibility

string

visible

No

Whether to display an element. Invisible borders occupy layout space. (To remove the borders, set the display attribute to none.) Available values are as follows:

• visible: The element is visible.
• hidden: The element is hidden but still takes up space.

flex

-

-

No

How to divide available space of the parent component for a child component.

You can set one, two⁵⁺, or three⁵⁺ values for this style.

Set one value in either of the following ways:

• A unitless number to set flex-grow.
• A valid width value⁵⁺ to set flex-basis.

Set two values⁵⁺ in the following ways:

The first value must be a unitless number used to set flex-grow. The second value must be either of the following:

• A unitless number to set flex-shrink.
• A valid width value to set flex-basis.

Set three values⁵⁺ in the following ways:

The first value must be a unitless number used to set flex-grow. The second value must be a unitless number used to set flex-shrink. The third value must be a valid width value used to set flex-basis.

flex-grow

number

0

No

How much a child component will grow. The value specifies allocation of the remaining space on the main axis of the parent component. Size of available space = Container size - Total size of all child components. Value 0 indicates that the child component does not grow.

flex-shrink

number

1

No

How much a child component will shrink. The shrink occurs only when the sum of default child component widths is greater than that of the parent component. Value 0 indicates that the child component does not shrink.

flex-basis

<length>

-

No

Initial length of the flex item on the main axis.

position

string

relative

No

Positioning type of an element. Dynamic changes are not supported.

• fixed: The element is positioned related to the browser window.
• absolute: The element is positioned absolutely to its parent element.
• relative: The element is positioned relative to its normal position.

[left|top|right|bottom]

<length>

-

No

left|top|right|bottom must be used together with position to determine the offset position of an element.

• The left attribute specifies the left edge position of the element. This attribute defines the offset between the left edge of a positioned element and that of a block included in the element.
• The top attribute specifies the top edge position of the element. This attribute defines the offset between the top edge of a positioned element and that of a block included in the element.
• The right attribute specifies the right edge position of the element. This attribute defines the offset between the right edge of a positioned element and that of a block included in the element.
• The bottom attribute specifies the bottom edge position of the element. This attribute defines the offset between the bottom edge of a positioned element and that of a block included in the element.