(This is a manual merge of #9102)

In tag helper, honor html_safe on array parameters; also make safe_join more similar to Array.join by first calling flatten.

Rails 3.2 API allowed arbitrary input for cdata_section;
this change re-introduces the old behaviour.

- Add attributes `allowfullscreen`, `default`, `inert`, `sortable`,
`truespeed`, `typemustmatch`.
- Fix attribute `seamless` (previously misspelled `seemless`).
- Use `assert_dom_equal` instead of `assert_equal` in test.

Closes #8091

'itemscope' is defined within HTML5 for use in microdata markup. See
http://www.whatwg.org/specs/web-apps/current-work/multipage/microdata.ht
ml#attr-itemscope

s/escape_once/html_escape/, since html safety is the contract that now says whether something has to be escaped

Signed-off-by: NYehuda Katz <yehudakatz@YK.local>

  This consists of:

  * String#html_safe! a method to mark a string as 'safe'
  * ActionView::SafeBuffer a string subclass which escapes anything unsafe which is concatenated to it
  * Calls to String#html_safe! throughout the rails helpers
  * a 'raw' helper which lets you concatenate trusted HTML from non-safety-aware sources (e.g. presantized strings in the DB)
  * New ERB implementation based on erubis which uses a SafeBuffer instead of a String

Hat tip to Django for the inspiration.

Example:
  content_tag('p', "limelight", :class => ["song", "play"])
  # => <p class="song play">limelight</p>
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Tag helper should output an attribute with the value 'false' instead of omitting the attribute, if the associated option is false but not nil.

Check whether blocks are called from erb using a special __in_erb_template variable visible in block binding.

Use output_buffer reader and writer methods exclusively instead of hitting the instance variable so others can override the methods.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8564 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7608 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7512 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

Fixed that content_tag with a block will just return the result instead of concate it if not used in a ERb view #7857, #7432 [michael.niessner]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6652 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6057 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

Clean up multiple calls to #stringify_keys in TagHelper, add better documentation and testing for TagHelper.  Closes #6394 [Bob Silva]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5857 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5344 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

Add <%= escape_once html %> to escape html while leaving any currently escaped entities alone.  Fix button_to double-escaping issue. [Rick]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5322 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5321 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4675 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

Wrap javascript_tag contents in a CDATA section and add a cdata_section method to TagHelper. Closes #1691.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2543 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2523 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

Added that nil options are not included in tags, so tag("p", :ignore => nil) now returns <p /> not <p ignore="" />  but that tag("p", :ignore => "") still includes it #1465 [michael@schuerig.de]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1789 5ecf4fe2-1ee6-0310-87b1-e25e094e27de