Thealignment-baseline attribute specifies how an object is aligned with respect to its parent. This property specifies which baseline of this element is to be aligned with the corresponding baseline of the parent. For example, this allowsalphabetic baselines in Roman text to stay aligned across font size changes. It defaults to the baseline with the same name as the computed value of thealignment-baseline property.

You can use this attribute with the following SVG elements:

• <tspan>
• <text>
• <textPath>

Usage notes

autoDeprecated

The value is the dominant-baseline of the script to which the character belongs - i.e., use the dominant-baseline of the parent.

baseline

Uses thedominant-baseline choice of the parent. Matches the box's correspondingbaseline to that of its parent.

before-edgeDeprecated

The alignment-point of the object being aligned is aligned with the "before-edge" baseline of the parent text content element.

text-bottom

Matches the bottom of the box to the top of the parent's content area.

text-before-edge

The alignment-point of the object being aligned is aligned with the "text-before-edge" baseline of the parent text content element.

Note:This keyword may be mapped totext-top.

middle

Aligns the vertical midpoint of the box with the baseline of the parent box plus half the x-height of the parent.

central

Matches the box's central baseline to the central baseline of its parent.

after-edgeDeprecated

The alignment-point of the object being aligned is aligned with the "after-edge" baseline of the parent text content element.

text-top

Matches the top of the box to the top of the parent's content area.

text-after-edge

The alignment-point of the object being aligned is aligned with the "text-after-edge" baseline of the parent text content element.

Note:This keyword may be mapped totext-bottom.

ideographic

Matches the box's ideographic character face under-side baseline to that of its parent.

alphabetic

Matches the box's alphabetic baseline to that of its parent.

hanging

The alignment-point of the object being aligned is aligned with the "hanging" baseline of the parent text content element.

mathematical

Matches the box's mathematical baseline to that of its parent.

top

Aligns the top of the aligned subtree with the top of the line box.

center

Aligns the center of the aligned subtree with the center of the line box.

bottom

Aligns the bottom of the aligned subtree with the bottom of the line box.

SVG 2 introduces some changes to the definition of this property. In particular: the valuesauto,before-edge, andafter-edge have been removed. For backwards compatibility,text-before-edge may be mapped totext-top andtext-after-edge totext-bottom. Neithertext-before-edge nortext-after-edge should be used with thevertical-align property.

Example

<svg  width="300"  height="120"  viewBox="0 0 300 120"  xmlns="http://www.w3.org/2000/svg">  <!-- Materialization of anchors -->  <path    d="M60,10 L60,110              M30,10 L300,10              M30,65 L300,65              M30,110 L300,110              "    stroke="grey" />  <!-- Anchors in action -->  <text alignment-baseline="hanging" x="60" y="10">A hanging</text>  <text alignment-baseline="middle" x="60" y="65">A middle</text>  <text alignment-baseline="baseline" x="60" y="110">A baseline</text>  <!-- Materialization of anchors -->  <circle cx="60" cy="10" r="3" fill="red" />  <circle cx="60" cy="65" r="3" fill="red" />  <circle cx="60" cy="110" r="3" fill="red" />  <style>    <![CDATA[      text {        font: bold 36px Verdana, Helvetica, Arial, sans-serif;      }    ]]>  </style></svg>

For object alignment in other elements (such as<text>), seedominant-baseline.

Specifications

Browser compatibility

See also

• CSSalignment-baseline property
• CSS baseline alignment