Надежный rules html. Правила построения HTML-документов

5. Значения атрибутов могут содержать пробелы или специальные символы, если они заключены в кавычках .

В некоторых атрибутах используются зарезервированные значения, такие как строки типа LEFT, RIGHT, CENTER . Данные значения не требуется заключать в кавычки .

Кавычки применяются только в случае, когда внутри значения имеются пробелы или специальные символы. Например, <IMG SRC=dog.gif ALT=”My dog Rover” >

6. Браузеры игнорируют пробелы в тексте HTML -документа . Браузеры преобразуют последовательность из нескольких пробелов и/или символов табуляции в HTML -документе в один единственный символ пробела . Таким образом, данные символы не могут быть использованы для форматирования выводимого на страницу текста (за исключением тега

, который сохраняет заранее произведенное оформление каждого символа
).

 
7. HTML -документы могут содержать комментарии

. Комментарии начинаются с символов
 

 
Название документа: Мой HTML -документ

 
Дата создания: 06/10/2005

 
2005 Big Company, Inc.

 
8. Элементы могут быть вложенными друг в друга, но не должны пересекаться

. Любой элемент, который открывается в тексте, заключенном внутри другого элемента, должны внутри этого элемента и закрываться

.


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 Attribute of What does  do? Was used to specify the display of internal borders between rows and colums. This attribute has been deprecated. Use CSS to style table borders instead. 
The Rules Attribute has been Deprecated
 This attribute has been deprecated and should not be used. Browser support for this attribute is limited and using it may produce unexpected results. Instead, use CSS to style tables.
The RULES Attribute
RULES , an HTML 4.0 attribute, indicates if there should be internal borders in the table. We"ll go over each of the values of RULES and demonstrate how they are used. RULES and FRAME have an annoying way of changing each other"s defaults. To simplify your life, here"s a rule of thumb: if you use RULES also use FRAME and BORDER . It"s easier to avoid getting confused.
The NONE Value for the RULES Attribute
RULES=NONE means that there are no inside borders. RULES=NONE is the default if you don"t use BORDER or set it to zero, but otherwise must be explicitly stated to have no inside borders. Note that currently Netscape does not recognize RULES .
 
Name
Food

Starflower
stir fied tofu

Miko
vegetable rice soup

Andy
hummus

Ping
french toast

The ALL Value for the RULES Attribute
RULES=ALL indicates that all the internal borders should be visible. RULES=ALL is usually used in conjunction with FRAME=VOID so that there are outer borders but no inner borders.
 
When applied to a table, that value gives us this result:
Name
Food

Starflower
stir fied tofu

Miko
vegetable rice soup

Andy
hummus

Ping
french toast

The COLS Value for the RULES Attribute
COLS indicates that there should be borders between the columns but not between rows.
 
When applied to a table, that value gives us this result:
Name
Food

Starflower
stir fied tofu

Miko
vegetable rice soup

Andy
hummus

Ping
french toast

The ROWS Value for the RULES Attribute
RULES=ROWS indicates that there should be borders between rows but not between columns.
 
When applied to a table, that value gives us this result:
Name
Food

Starflower
stir fied tofu

Miko
vegetable rice soup

Andy
hummus

Ping
french toast

The GROUPS Value for the RULES Attribute
RULES=GROUPS allows you to put borders between groups of table cells. There are two ways cells can be grouped: by row and by column. Let"s go over each of them. Note that currently Netscape does not recognize RULES .
Grouping By Row
To group by row use the  ,  ,  tags.  indicates the header rows of the table,  indicates the main body of the table, and  indicates the bottom rows. So, for example, this code creates a table with three groups. Borders appear just between groups:
 
 
 
Name
Food
Price
 
 
 
Starflower
stir fied tofu
5.95
 
Miko
vegetable rice soup
4.95
 
Andy
hummus
3.95
 
Ping
french toast
5.95
 
 
 
Total
20.80
 
 
 
Here"s how that table renders:
Name
Food
Price

Starflower
stir fied tofu
5.95

Miko
vegetable rice soup
4.95

Andy
hummus
3.95

Ping
french toast
5.95

Total
20.80

Grouping By Column
To group by column use the  tag and its SPAN attribute.  takes a little getting used to because it doesn"t actually go around any table cells. It goes at the top of the table code where it sets rules about the table columns including which are grouped together.  to indicates how many columns are in each group. If you leave SPAN out then it is assumed the group has just one column. So, for example, the following code says that the first column is in a group by itself and the three after that are together in a group. Notice that  requires an end tag. Borders will go only between the groups.