contents is vs contents are

Some examples from the web:

• Design reference temperature means the temperature at which the vapour pressure of the contents is determined for the purpose of calculating the MAWP.
• whereas access of disabled and elderly people to public websites and their contents is an opportunity to improve their participation in society,
• The table of contents is amended as follows:
• the list of contents is amended as follows:
• The table of contents is replaced by the following:
• E. Whereas access of disabled and elderly people to public WEB sites and their contents is an opportunity to improve their participation in society;
• If no query has been performed, the whole keybox contents is re-fetched and re-displayed.
• Named buffers are not saved across sessions. The only way to save their contents is to paste them into images.
• The current definition of flammable contents is not sufficient to guarantee a high level of safety in all cases.
• It is also important that the use of fiscal incentives to achieve lower sulphur contents is not prevented.
• This use is recommended when the ratio of magnesium and phosphoric anhydride contents is higher than 0,03 (Mg/P2O5 > 0,03).
• Where the actual contents are not measured, the check carried out by the packer shall be so organized that the quantity of the contents is effectively ensured.
• The adoption of the Protocol and its feeble contents is nothing more than a slap in the face to the national parliaments and the EP, and to the voters whom they represent.
• The Commission fails to understand why on the one hand the GOC considers these to be confidential internal documentation and on the other the summary of the contents is allegedly published on the website of PBOC.
• I believe that this political responsibility - let us be frank - does not just apply in the case of children but in this aspect finds an example which due to the sensitivity of its contents is certainly a practical one.
• The destruction process takes on the form of combined police operations between the Mozambican Police service and the South African Police Service comprising of multi-disciplinary teams reacting on information on the location of the hidden and abandoned arms caches, and once identified their contents is destroyed.
• The contents is poured into a drinking glass, the jar a second and third time filled with water and the contents transferred into the drinking glass, so that approximately 30 ml of test solution is obtained.

Some examples from the web:

• There's a large open container, and the contents are missing.
• - it contents are factually accurate, and
• Authorised users shall remain solely responsible for the information they provide and shall ensure that its contents are fully compliant with existing Community and national law.
• The contents are exactly like the Spring Sale.
• The Regulation is directly applicable in the Member States and it does not require any implementation measures. It is published in the Official Journal of the European Union, therefore its contents are accessible to all interested parties.
• The file whose contents are displayed below
• The contents are of great importance to us.
• Jackson, this strongbox... its contents are a primary concern.
• It's hard to prove what was stolen when the contents are unknown.
• Its contents are consistent with the conclusions of the Berlin European Council of 24 and 25 March 1999.
• When you select a data file in the above line, its contents are displayed here.
• Its contents are like a clockwork backwards from the time of death, but you must hurry.
• After registration of the Internet website, the information on a medicinal product contained therein may be provided by the marketing authorisation holder on other Internet websites throughout the Community if the contents are identical.
• A farm return shall be regarded as having been duly completed where its contents are factually accurate and the accountancy data contained therein have been recorded and are presented in accordance with Regulation (EC) No 868/2008.
• The contents are locked. In order to view the contents, enter the correct password.
• The requirements of 4.3.2.2.1 (a) to (d) above shall not apply to tanks whose contents are, by means of a heating device, maintained at a temperature above 50 ºC during carriage.
• I'll see the contents are returned to their rightful owners.
• The contents are always the same.
• His stomach contents are saturated with it.
• Specific methods for the determination of lead, cadmium and mercury contents are not prescribed.