Transferring my comment to an answer, because it makes logical sense. However, please note that this is unfounded conjecture. The actual reasoning of why the spec is written this way is still, technically, unknown. Element height is defined by the height of the children. If an element has padding-top: 10% (relative to parent height), that … Read more
http://www.w3.org/TR/html4/interact/forms.html#h-17.5 Buttons created with the BUTTON element function just like buttons created with the INPUT element, but they offer richer rendering possibilities: the BUTTON element may have content. For example, a BUTTON element that contains an image functions like and may resemble an INPUT element whose type is set to “image”, but the BUTTON element … Read more
The W3C says quotes are optional, all three of your ways are legal. Opening and closing quote just need to be the same character. If you have special characters in your URL, you should use quotes or escape the characters (see below). Syntax and basic data types The format of a URI value is ‘url(‘ … Read more
From the CSS 2.1 Spec: When an inline box contains an in-flow block-level box, the inline box (and its inline ancestors within the same line box) are broken around the block-level box (and any block-level siblings that are consecutive or separated only by collapsible whitespace and/or out-of-flow elements), splitting the inline box into two boxes … Read more
Here is a good article from the MDC which explains the problems (and solutions) to form autocompletion. Microsoft has published something similar here, as well. To be honest, if this is something important to your users, ‘breaking’ standards in this way seems appropriate. For example, Amazon uses the ‘autocomplete’ attribute quite a bit, and it … Read more
It is claimed in the book that an inline element has complete padding properties but no margin-top/button properties, only margin-left/right properties. My first question is, where can I find this as an official statement? You won’t, because it isn’t quite true. In the box model it says that for margin-top and margin-bottom: These properties have … Read more
Methods for Aligning Flex Items along the Main Axis As stated in the question: To align flex items along the main axis there is one property: justify-content To align flex items along the cross axis there are three properties: align-content, align-items and align-self. The question then asks: Why are there no justify-items and justify-self properties? … Read more