valign in-depth understanding

Valign said his understanding is that since the need for its words, that is, the first must be at the same level, followed by its corresponding need to have a definite value (plus a fixed row height)

A prerequisite for a functioning

Works against the following two classes

1 Inline level: img Strong em and other unknown tags that function are added to the element

The Inline-block:input button (block does not work on it) is added to the element

2 Table-cell TD only works on its own, so it needs to be on its own to achieve the effect

Two valign and Line-height each other

1 because of the presence of a row height, as an inline element, a gap appears below

2 Elimination of voids (1) instead of a block element (2) Set the row height and font size to 0 (3) to change the default vertical mode I think the essence of the font is reserved for the bottom line height equals 0 with the top to use it

Three my understanding of the alignment baseline

Alignment of the baseline, first will be reserved, followed by a simple drawing of a line, so that the elements of the line for it, it is strictly affected by the row height

To explain the above words, in the absence of content, the edge of the box to align, when there is content, the content is aligned.

Four-center alignment

That is, the element and the parent element of the basic line +1/2 line high, to the center of it, the problem is that the font center sink caused, so the font is set to 0 is good

Vertical center of picture

valign in-depth understanding