Overriding style rules for styling web elements

1. A method of styling elements of a web document at a time of rendering the web document, comprising:

performing on a processor:

for each element of a plurality of elements in the web document:

determining an associated rule list for the element in the web document;

determining whether one or more rules for the element exists in the associated rule list;

generating the one or more rules for the element when no rule for the element is determined to exist in the associated rule list;

applying one or more filters to the one or more rules, the one or more filters comprising at least one of an important filter, a highest priority filter, and a single target filter;

determining a dominant rule from the one or more rules for each property of a plurality of properties in the element based on the one or more filters; and

determining a grouping of dominant rules from the plurality of properties;

determining a grouping of the plurality of elements;

generating a group overriding rule based on the grouping of dominant rules from each element in the grouping of the plurality of elements; and

updating a style sheet based on the group overriding rule.

2. The method of claim 1 , wherein the generating the group overriding rule comprises modifying a selector of the dominant rule.

3. The method of claim 2 , further comprising updating the web document based on the modifying of the selector of the dominant rule.

4. The method of claim 2 , wherein the modifying the selector comprises:

generating a new class or attribute selector; and

modifying the selector to include the new class or attribute selector.

5. The method of claim wherein the modifying the selector comprises:

generating an overriding selector for each element of the plurality of elements; and

providing each of the overriding selectors in the selector.

6. The method of claim wherein the generating the overriding selector comprises:

determining an overriding selector for each property of the plurality of properties; and

selecting one of the overriding selectors with highest specificity among the overriding selectors for the plurality of properties.

7. The method of claim 6 , further comprising:

identifying the dominant rule based on a plurality of rules, and

wherein the generating the overriding selector is based on the dominant rule.

8. The method of claim 1 , further comprising:

determining whether to group a property of the plurality of properties across the plurality of elements for applying a same rule to the property in each of the plurality of elements; and

generating an overriding selector for the property when the property is determined to be grouped across the plurality of elements.

9. The method of claim 1 , further comprising:

formatting the plurality of elements based on the updated style sheet; and

providing for display a rendering of the web document with the formatted plurality of elements.

10. A system for styling elements of a web document at a time of rendering the web document, comprising:

one or more processors; and

a machine-readable medium comprising instructions stored therein, which when executed by the processors, cause the processors to perform operations comprising:

for each element of a plurality of elements of the web document:

determining an associated rule list for the element in the web document;

determining whether one or more rules for the element exists in the associated rule list;

generating the one or more rules for the element when no rule for the element is determined to exist in the associated rule list;

applying one or more filters to the one or more rules, the one or more filters comprising at least one of an important filter, a highest priority filter, and a single target filter;

determining a dominant rule from the one or more rules for each property of a plurality of properties in the element based on the one or more filters; and

determining a grouping of dominant rules from the plurality of properties;

determining a grouping of the plurality of elements;

generating a group overriding rule based on the grouping of dominant rules from each element in the grouping of the plurality of elements; and

updating a style sheet based on the group overriding rule.

11. The system of claim 10 , wherein generating the group overriding rule comprises modifying a selector of the dominant rule.

12. The system of claim 11 , wherein the operations further comprise updating the web document based on the modifying of the selector of the dominant rule.

13. The system of claim 11 , wherein modifying the selector comprises:

generating a new class or attribute selector; and

modifying the selector to recite the new class or attribute selector.

14. The system of claim 11 , wherein modifying the selector comprises:

generating an overriding selector for each element of the plurality of elements; and

providing each of the overriding selectors in the selector.

15. The system of claim 14 , wherein generating the overriding selector comprises:

determining the overriding selector for each property of the plurality of properties; and

selecting one of the overriding selectors with highest specificity among the overriding selectors for the plurality of properties.

16. The system of claim 15 , further comprising identifying the dominant rule based on a plurality of rules, and wherein the overriding selector is determined based on the dominant rule.

17. The system of claim 11 , wherein the operations further comprise:

determining whether to group a property of the plurality of properties across the plurality of elements for applying a same rule to the property in each of the plurality of elements; and

generating an overriding selector for the property when the property is determined to be grouped across the plurality of elements.

18. The system of claim 11 , wherein the operations further comprise:

formatting the plurality of elements based on the updated style sheet; and

providing for display a rendering of the web document with the formatted plurality of elements.

19. A computer program product for styling elements of a web document at a time of rendering the web document, the computer program product comprising:

a non-transitory tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:

for each element of a plurality of elements of the web document:

determining an associated rule list for the element in the web document;

determining whether one or more rules for the element exists in the associated rule list;

generating the one or more rules for the element when no rule for the element is determined to exist in the associated rule list;

applying one or more filters to the one or more rules, the one or more filters comprising at least one of an important filter, a highest priority filter, and a single target filter;

determining a dominant rule from the one or more rules for each property of a plurality of properties in the element based on the one or more filters; and

determining a grouping of dominant rules from the plurality of properties;

determining a grouping of the plurality of elements;

generating a group overriding rule based on the grouping of dominant rules from each element in the grouping of the plurality of elements; and

updating a style sheet based on the group overriding rule.

20. The computer program product of claim 19 , wherein the method further comprises:

determining whether to group a property of the plurality of properties across the plurality of elements for applying a same rule to the property in each of the plurality of elements; and

generating an overriding selector for the property when the property is determined to be grouped across the plurality of elements.