Blueprint sets the line height for the entire page to 18 pixels, so every image and variant of text must be a multiple of 18 pixels.
Blueprint将整个页面的线高度设置为18像素，因此每个图像和文本都必须是18像素的倍数。
The template sets the font for the line of text (and, therefore, the height of the line) using the element's height attribute.
该模板将使用元素的height属性设置文本行的字体(并因此设置行的高度)。
Next, you override the measure() method and measure the height and width of the text using text-line metrics.
接下来，覆盖 measure()方法并使用文本行单位度量文本的height和width。
The height of one line of text with this style, measured in pixels. (Read Only).
这个样式的文本一行的高度，以像素计算。(只读)。
It only works for a single line of text though, because we set the line's height to the same height as the containing box element.
单行文本，因为我们将行的高度设置为与包含框元素相同的高度。
It only works for a single line of text though, because we set the line's height to the same height as the containing box element.
单行文本，因为我们将行的高度设置为与包含框元素相同的高度。
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