如何使用SVG与跨浏览器兼容性垂直对齐文本？

Question

请注意以下代码段:

<svg style="" width="60" height="60">
    <rect 
        x            = "0"
        y            = "0"
        rx           = "1"
        ry           = "1"
        width        = "17"
        height       = "15"
        fill         = "rgb(254,199,186)"
        stroke       = "rgb(152,119,111)"
        stroke-width = "1">
    </rect>
    <text 
        x                  = "8"
        y                  = "8"
        fill               = "rgb(50,39,37)"
        font-size          = "16"
        font-family        = "monospace"
        alignment-baseline = "middle"
        text-anchor        = "middle">
        a
    </text>
</svg>

Chrome会将该代码段呈现为:

而在FireFox上,这是结果:

如何以跨浏览器兼容的方式复制此代码段？

Answer 1

Firefox不支持" alignment-baseline ".尝试使用属性" 显性基线 ",它应该适用于两者(Chrome和Firefox但不适用于IE,见下文).

看看这个老答案

根据SVG规范,alignment-baseline仅适用于"tspan","textPath","tref"和"altGlyph".我的理解是它用于抵消它们上面的"文本"对象.我认为你所寻找的是显性基线.

它适用于Chrome和Firefox,但不适用于IE.如果你还想在IE中使用垂直居中的文本,你必须使用这样的工作方式:

<svg style="" width="60" height="60">
<rect 
    x            = "0"
    y            = "0"
    rx           = "1"
    ry           = "1"
    width        = "17"
    height       = "15"
    fill         = "rgb(254,199,186)"
    stroke       = "rgb(152,119,111)"
    stroke-width = "1">
</rect>
<text 
    id                 = "default-text"
    x                  = "8"
    y                  = "8"
    fill               = "rgb(50,39,37)"
    font-size          = "16"
    font-family        = "monospace"
    alignment-baseline = "middle"
    dominant-baseline  = "middle"
    text-anchor        = "middle">
    a
</text><script>
    window.onload = function() {
        var text = document.getElementById("default-text"),
            bbox = text.getBBox(),
            actualHeight = (4 - bbox.y),
            fontSize = parseInt(window.getComputedStyle(text)["fontSize"]),
            offsetY = (actualHeight / 2) - (bbox.height - fontSize);

        text.setAttribute("transform", "translate(0, " + offsetY + ")");
    }
</script>