![]() ![]() I have not found a suitable Chinese translation for this word, it should be noted that this value is not leading, which means the distance between the baselines of two lines of text. Line Gap: Line gap represents the distance from the bottom of Descent to the top of the next line ascent.Descent: The distance from the bottom of a text to the baseline. Descender/descent: Descender is the descender stem of a lower-case letter extended below the baseline, such as the bottom of the j or G.Ascent represents the distance from the top of the text to the baseline. Ascender may be a bit higher than capital height for identification purposes. Ascender/ascent: Ascender (ascending part) denotes the stem of a lowercase letter that exceeds the height of the x.Capital height: Capital height indicates the height of a capital letter on the baseline.X height: x height represents the height of the lowercase letter X on the baseline.Baseline: Baseline is the level at which letters are placed.Here are a few common concepts, using this image from Wikipedia (the following measures are in relative units based on EM) : There are many concepts and metrics of fonts themselves. Em is typically 1000 in OpenType fonts and 1024 or 2048 (a power of 2) in TrueType fonts. For example, 1000 units of font with 16pt font size would be 16pt. The units of measurement are relative units that scale according to the actual font size. In digital typography, em is a square that has been sized. In metal type, the container is the metal block for each character, and in a type, they are all uniform in height, so that each type can be placed into a printing tool and printed. This value forms a Square, so that all letters can be accommodated, and this value actually reflects the height of the font container. This value was originally used in typography to represent the width of a font with a capital M. First of all, a font has EM Square (also known as UPM, EM, EM Size). Here are some concepts related to fonts in Western Language. To answer this question, we need to have a deeper understanding of fonts. As you can see from the image, although the font size is 40px, they are all different in width and height, so the font size does not set the actual size of the text. ![]() The following figure shows an example where the label of the text is span, and the text of each font is set with a red outline for observation, and line-height: normal is set. ![]() Here's a question: when we set font size to the text in the CSS, what properties of the font are actually set to this value? If we select the text with the mouse, we can see that the selected area is indeed vertically centered in the parent container, so why the text is higher and lower? Here comes the construction of the font itself and the associated metrics. View online: CodePen (Font file directly references Google fonts, if there is no effect need to pay attention to the network situation)įont-size: 16px font-size: 16px vertical-align:middle 0, vertical-align:middle aligns the child element's midpoint with the parent element's baseline + x-height / 2, and sets the font size to 0 to ensure that the lines align at the midpoint. Common vertical middle methodīelow is a use of various common vertical centered approach to center text example, which involves different fonts are mixed, you can see, although it took several common vertical centered approach, but in the actual look and feel these words are not just the vertical center, some words look more centered, some words have offset badly. Introduction to vertical center is basically a CSS must grasp the problem, we must all seen in all kinds of tutorial "CSS centered vertically N method", in general, these methods already can satisfy all sorts of use scenario, however, when we met need to use some special fonts are mixed, or make the text alignment icon, You might find that no matter which vertically centered method you use, it always feels like the text is shifted a few pixels up or down, and you have to specifically shift them. ![]()
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