The use of Layout-grid-char attributes in CSS

Grammar:

Layout-grid-char:none | Auto | Length

Parameters:

None: Row grid values are not specified
Auto: Determines the grid by maximum characters in the object text
Length: Percent | A length value consisting of a floating-point number and a unit identifier whose percentage value is based on the parent object size. See Length Units

Description

Sets or retrieves the character grid values applied to the object text.
To implement this property, Layout-grid-mode must be set to char or both.
Its visual effect is similar to the Line-height property. Applies only to block objects (such as Div).
Its visual effect is similar to the Line-height property.
Documents written in East Asian languages (such as Chinese, Japanese) typically use the page layout of characters based on one-dimensional or two-dimensional meshes. You can use the Layout-grid property to add this layout to a Web page document.
This property applies only to block objects (such as Div).
For this property to work, the Layout-grid-mode property value must be set to line or both.
This property is read-only for Currentstyle objects. Readable and writable for other objects.
The corresponding script attribute is Layoutgridchar.
Example:

div {Layout-grid-char:auto;}

Layout-grid-char:none;            Layout-grid-line:none;            Layout-grid-mode:none;            Layout-grid-type:loose;

Why is the hint not a known CSS property name

This does not affect the effect bar, overflow-x, OVERFLOW-Y also hint but the effect is still out