Errata

Original: "These rules govern not only the containing block of the element, but also how it is laid out within that element."

I'm not entirely sure what the '...how *it* is laid out within that element.' refers to.

Change to: "These rules govern not only the containing block of the element, but also how the element is laid out within that containing block." (credits to Eric himself)

Missing index entries for position: absolute; and position: sticky;

Original: "…hypothetical grid lines between the cells…"

The concept of hypothetical grid lines is stated without context and should probably explained to avoid confusion.

Original: "The same mapping warnings that applied to inches also apply to centimeters."

The warnings reffered to should probably be stated in the first entry (about centimeters) and then referred to in the following entries about absolute units of measurement.

em: entry could use a pointer to the parent as a reference for percentage values

rem: entry could use some hints about the difference to em and its usage, seems a bit terse compared to the entry about NULL-width (just my 10 cents… ;)

em: entry could use a pointer to the parent as a reference for percentage values

rem: entry could use some hints about the difference to em and its usage, seems a bit terse compared to the entry about NULL-width (just my 10 cents… ;)

Original: "Custom properties are scoped to the element to which they are applied."

This seems to imply that the scope of custom properties/CSS vars is limited to a certain property. Maybe the word "scoped" should be changed in favour of "applied"?

Entry about "Arbitrary Substring Attribute Value Selector":
missing index entry

Original: "This includes any form input element in (X)HTML, but does not include hyperlinks."

Suggested fix: "This includes any form input element in HTML, but does not include hyperlinks." – remove (X) to conform with rest of book.

Original: "Four values, each a percentage, a number, a <length> made absolute, or the auto keyword"

Missing format for "percentage" and "number"

Suggested fix: "Four values, each a <percentage>, a <number>, a <length> made absolute, or the auto keyword"

Original: "A shorthand property that defines the rounding radius for the bottom-right corner of an element’s border."

Suggested fix: "A shorthand property that defines the rounding radius corners of an element’s border."

"Animatable" section is redundant with the title line ("Anim: P")

Original: "Defines whether the height and width of the ele‐ ment define the dimensions of the content box (the historical behavior) or the border box."

Mention of padding-box is missing

Suggested fix: "Defines whether the height and width of the ele‐ ment define the dimensions of the content box (the historical behavior), the padding box or the border box. "

"Animatable" section is redundant with the title line

Original: "Co_n_puted value"
Should be: "Computed value"

Original: "The background of the element will extend through‐ out the padding."

IMHO missing note about influence of 'box-sizing' property in this context.

Suggested fix: "The background of the element will extend through‐ out the padding (unless this behaviour has been redefined e.g. via box-sizing)."