*549In this products liability case, plaintiffs Kawika Demara (Demara) and Sandra Demara (together, Plaintiffs) appeal from a summary judgment granted in favor of *107defendants The Raymond Corporation (Raymond) and Raymond Handling Solutions, Inc. (RHSI) (together, Defendants). As relevant to this appeal, Plaintiffs asserted claims for strict liability and negligence based on injuries Demara suffered allegedly as a result of design defects in a forklift designed by Raymond and sold by RHSI.
Depending on the facts of a given case, a claim based on an alleged design defect can be proven by a plaintiff under the consumer expectation test, where the plaintiff proves that "the product failed to perform as safely as an ordinary consumer would expect when used in an intended or reasonably foreseeable manner"; additionally, such a claim can be defeated by a defendant under the risk-benefit test (where, after the plaintiff presents a prima facie case that a product's design caused damages, the defendant proves that "on balance, the benefits of the challenged design outweigh the risk of danger inherent in such design"). ( Barker v. Lull Engineering Co. (1978)
We conclude that the trial court erred in these rulings. First, because Plaintiffs' showing as to causation was more than negligible or theoretical, it was sufficient to defeat summary judgment. Second, Defendants did not meet their burden of establishing as a matter of law that the consumer expectation test does not apply to Plaintiffs' claims. Third, in applying the risk-benefit test, Defendants failed to present sufficient evidence to shift the burden to *550Plaintiffs to show a triable issue of material fact. Accordingly, we reverse the judgment and remand with instructions to deny Defendants' motion.
I.
STATEMENT OF FACTS
" 'Because this case comes before us after the trial court granted a motion for summary judgment, we take the facts from the record that was before the trial court when it ruled on that motion.' " ( Wilson v. 21st Century Ins. Co. (2007)
The product at issue in this lawsuit is a Raymond 7400 series narrow aisle reach forklift, model 740-R35TT and serial number 740-06-DA04252 (Subject Lift). The Subject Lift was designed by Raymond and sold by RHSI to Seltzer Chemicals. It was manufactured (by Raymond) in January 2006 as a special order-built to the specifications of Seltzer Chemicals, which later became known as Glanbia Nutritionals (NA), Inc. (Glanbia).
Each of the lifts in the Raymond 7400 series (which includes the Subject Lift) has both an electric drive wheel and a caster *108wheel in the rear. Linked together, these two wheels turn in unison, which allows the lift to pivot as the drive wheel is steered. For example, as the back of the lift swings to its left in reverse, the drive wheel becomes the leading edge as the lift turns.
When it designed the 7400 series, Raymond knew that the lifts would be used in and around warehouse workers. In addition, Raymond knew that if the moving drive wheel came into contact with any body part, the body part could be crushed. The design includes an open area around the drive wheel with no guards, gates, skirts or bumpers. The design also includes an optional amber light that flashes as a warning to pedestrian workers and others in the area when the lift is in use. This light can be attached to the metal guard above the driver's compartment to one side of the lift-with either a top mount, so that the light shines above the guard, or a bottom mount, so that the light shines below the guard. The Subject Lift specially ordered by Seltzer Chemicals had the optional warning light attached to the guard with a top mount.
On September 29, 2011, the Glanbia warehouse in Carlsbad was busy and noisy with lifts operating and pedestrians walking in and around the area of *551the accident.
II.
STATEMENT OF THE CASE
Plaintiffs filed the underlying action, seeking damages for Demara's injuries and for Sandra Demara's loss of consortium. In a single cause of action for products liability as to the Subject Lift, Plaintiffs alleged two counts-one for strict liability based on claims for defects in the manufacture, design and warnings, and one for negligence. Plaintiffs initially named only RHSI but later amended their complaint to add Raymond as an additional defendant.
Defendants moved for summary judgment or, alternatively, for summary adjudication of claims. In support, Defendants submitted a memorandum of points and authorities, a separate statement of undisputed material facts, an expert's declaration and exhibits. Plaintiffs filed an opposition, which included a memorandum of points and authorities, a responsive separate statement of undisputed material facts, two expert declarations, two percipient witness declarations, exhibits and objections to Defendants' evidence. In reply, Defendants submitted a memorandum of points and authorities, a reply to the responsive separate statement, a declaration with exhibits and objections to Plaintiffs' evidence.
By written order, the superior court granted Defendants' motion, concluding in relevant part as follows. First, Plaintiffs failed to establish a triable issue of material fact with regard to whether either the lack of a wheel guard or the placement of the warning light caused Demara's injuries. Second, Defendants established as a *109matter of law that the Subject Lift was not defectively designed on the following grounds: the consumer expectation test is inapplicable, "because the minimum safety of the [Subject Lift]'s design is not within the common knowledge of ordinary consumers"; and Plaintiffs did not present expert testimony to contradict (or otherwise raise a triable issue of material fact in response to) Defendants' expert's testimony that established, *552under the risk-benefit test, that "the benefits of the design outweigh the risks of the design."
The court filed a judgment in favor of Defendants and against Plaintiffs. Following notice of entry of the judgment, Plaintiffs timely appealed.
III.
DISCUSSION
We review de novo an order granting summary judgment. ( Aguilar v. Atlantic Richfield Co. (2001)
A defendant is entitled to a summary judgment on the basis that the "action has no merit" ( Code Civ. Proc., § 437c, subd. (a) ) only where the court is able to determine from the evidence presented that "there is no triable issue as to any material fact and that the moving party is entitled to a judgment as a matter of law" (id. subd. (c)). A cause of action "has no merit" if one or more of the elements of the cause of action cannot be established, or an affirmative defense to the cause of action can be established. (Id. subd. (o).)
*553The defendant has the ultimate burden of persuasion that one or more elements of the cause of action at issue "cannot be established" or that "there is a complete defense to that cause of action." ( Code Civ. Proc., § 437c, subd. (p)(2) ; Aguilar , supra , 25 Cal.4th at pp. 849, 850, 853-854,
In this appeal from the grant of a summary judgment, therefore, we determine first whether Defendants' showing establishes their entitlement to judgment in their favor; if so, we then determine whether Plaintiffs' showing establishes a triable issue of material fact. ( Blackwell v. Vasilas (2016)
A. Introduction
" 'Products liability is the name currently given to the area of the law involving the liability of those who supply goods or products for the use of others to purchasers, users, and bystanders for losses of various kinds resulting from so-called defects in those products.' " ( Merrill v. Navegar, Inc. (2001)
A plaintiff in a products liability case may seek recovery on theories of both strict liability and negligence. ( Jiminez v. Sears, Roebuck & Co. (1971)
In addition to causation, as applicable here, a strict products liability plaintiff must also establish that the design of the product at issue was defective.
The two theories are not mutually exclusive, and depending on the facts and circumstances of the case, both may be presented to the trier of fact in the same case. ( Saller , supra , 187 Cal.App.4th at p. 1232,
B. The Trial Court Erred in Granting Summary Judgment Based on a Lack of Causation
Under both the consumer expectation test and the risk-benefit test, in proving a cause of action for design defect, the plaintiff must establish that the product's failure to perform safely was a substantial factor in causing harm to the plaintiff. ( Campbell v. General Motors Corp. (1982)
In the trial court, Defendants moved for summary judgment, in part, on the basis that Plaintiffs cannot establish that the design of the forklift was a substantial factor in causing harm to Demara. As part of their argument that the design of the Subject Lift was not defective, Defendants argued, with citation to legal authority, that the occurrence of an accident or injury while a product is being used does not, by itself, establish a product defect. In a single sentence at the end of a paragraph, Defendants concluded, with no citation to authority or evidence: "[T]he fact that an accident involving the [Subject Lift] occurred is not sufficient evidence ... that any alleged defect caused [P ]laintiffs' injuries and damages ."
*112That lone assertion does not constitute a sufficient showing of the nonexistence of a triable issue of material fact to have shifted the burden to Plaintiffs on the issue of causation. (See Aguilar , supra , 25 Cal.4th at p. 850,
Where, as here, the plaintiff has the burden of proof of a specific material fact, like causation, by a preponderance of the evidence, for the defendant to be entitled to summary judgment, the defendant must present evidence establishing that no reasonable trier of fact could find the underlying material fact in the plaintiff's favor. ( Aguilar , supra , 25 Cal.4th at p. 851,
Even if we were to assume that Defendants met their initial burden, the evidence submitted by Plaintiffs in response creates a triable issue of fact *556as to whether the alleged defects were a substantial factor in causing Demara's injuries. (See Aguilar , supra , 25 Cal.4th at pp. 850-851,
In Pietrone v. American Honda Motor Co. (1987)
From the evidence submitted, Plaintiffs established: The area on the outside of the drive wheel of the Subject Lift is open, with no guard, gates, skirts or bumpers; as the leading edge of the Subject Lift swung *113into Demara, his foot went under the lift and was crushed by the exposed wheel. The evidence further established: The Subject Lift had a flashing light attached to the top of the metal guard above the driver's compartment; at certain close distances, the light on the overhead guard was not visible to, and was thus ineffective as a warning light for, pedestrians; and Demara did not see the light (or the Subject Lift) as the lift approached and swung toward him before striking him. Given this evidence and the inferences from this evidence, the trial court erred in ruling that Plaintiffs did not meet their burden of establishing a triable issue of material fact as to causation.
C. The Trial Court Erred in Granting Summary Judgment Based on the Lack of a Defect
In a products liability cause of action, the consumer expectation test is a theory by which a plaintiff may prove the existence of a design defect, and the risk-benefit test is a theory by which the defendant may prove the *557nonexistence of a design defect. ( Barker , supra , 20 Cal.3d at pp. 431-432, 435,
Defendants argue, and the trial court ruled, that only the risk-benefit test applies, because the appropriate analysis of the Subject Lift's design "necessarily involved determining technical issues of 'feasibility, cost, practicality, risk, and benefit,' " which cannot be resolved on the basis of ordinary consumer expectations. (Quoting Soule , supra , 8 Cal.4th at pp. 562, 567,
Whether alleged as a strict liability claim or a negligence claim, a plaintiff must first establish the existence of a defective design. ( Lambert v. General Motors (1998)
1. Consumer Expectation Test
Under the consumer expectation test, a product is defective in design if *114it failed to perform as safely as an ordinary consumer would expect, or have a right to expect, when using the product in an intended or reasonably foreseeable manner. ( Barker , supra , 20 Cal.3d at pp. 432, 435,
As we explained at part III.B., ante , Defendants are not entitled to summary judgment based on a lack of causation. As part of their motion, Defendants did not attempt to meet their initial burden of showing that Plaintiffs could not produce evidence that the product failed to satisfy ordinary consumer expectations as to safety. Instead, they argued that, as a matter of law, the consumer expectation test is inapplicable to the Subject Lift, because the Subject Lift is a "complex piece of industrial equipment" "beyond the typical understanding of the ordinary consumer." The trial court agreed and declined to apply the consumer expectation test on the basis that "the minimum safety of the [Subject Lift]'s design is not within the common knowledge of ordinary consumers"-at least in part because "the analysis of the [Subject Lift]'s design necessarily involves determining technical issues of feasibility, cost, practicality, risk and benefit, ... [which] require[s] expert opinion about the merits or deficiencies of the design."
However, the "inherent complexity of the product itself is not controlling" in determining whether the consumer expectation test applies. ( *115McCabe v. Amer ican Honda Motor Co. (2002)
Further, contrary to Defendants' argument, the consumer expectation test is not based on minimum safety assumptions or expectations of consumers in general regarding a product but rather, on the minimum safety assumptions or expectations of the "product's users." ( Soule , supra , 8 Cal.4th at p. 567,
In Barker , supra ,
In Campbell , supra ,
In McCabe , supra ,
In Saller , supra ,
These authorities reinforce the concept that, depending on the circumstances of a particular case, the consumer expectation test can apply to complex or technical products, even where the use of these products may not be within the common knowledge of jurors. In our independent review of the record in this appeal ( Aguilar , supra , 25 Cal.4th at p. 860,
The drive wheel, which is what crushed Demara's right foot, is located on the back left side of the Subject Lift. The exhibits in the record inform that the Subject Lift has a solid guard or skirt at the bottom that extends from its base to the floor, almost touching the floor, on its left and rear sides-except where there is a cutout area at the left rear corner that exposes the drive *562wheel. The Subject Lift also has a flashing warning light attached to the top of a guard rail that is located above where the driver stands and across the width of the lift.
Based on this information, jurors could reasonably find that the ordinary consumers of the Subject Lift included workers in the warehouse in which the Subject Lift was being operated. Further, jurors could reasonably find that these ordinary consumers of the Subject Lift could form certain minimum safety assumptions and expectations for the product-in particular, both (1) for the partial guard (or skirt) at the base of the lift, and (2) for the placement of the warning light on the top of the guard rail. Correspondingly, jurors could reasonably find that the Subject Lift's design fell below these assumptions and expectations-for example, (1) by not including a complete guard (or skirt) at the base of the lift that fully covers the area around the drive wheel so that the wheel is not exposed, and (1) by placing the warning *118light in a location from which nearby pedestrians are not able to see it flashing. Potential findings like these do not involve complex or sophisticated technology or an understanding of concepts outside the scope of everyday experiences of the consumers of the product.
For the foregoing reasons, Defendants did not meet their burden of establishing that the consumer expectation test is not applicable to Plaintiffs' claims, and the trial court erred in concluding otherwise. Although this error is sufficient to reverse the judgment without a discussion of the risk-benefit test, we will briefly review the trial court's ruling regarding the applicability of that test, for the benefit of the trial court and parties on remand.
2. Risk-Benefit Test
Under the risk-benefit test, after the plaintiff makes a prima facie showing of causation, i.e., that the design of the product was a substantial factor in bringing about the plaintiff's injury, the burden of persuasion shifts to the defendant to establish that the benefits of the design, in light of the feasibility and costs of an alternative design, outweigh the risks of danger inherent in the design. ( Barker , supra , 20 Cal.3d at pp. 431-432, 435,
This standard requires the trier of fact to consider "among other relevant factors, the gravity of the danger posed by the challenged design, the likelihood that such danger would occur, the mechanical feasibility of a safer alternative design, the financial cost of an improved design, and the adverse consequences to the product and to the consumer that would result from an alternative design." ( Barker , supra , 20 Cal.3d at p. 431,
Given the foregoing factors to be considered, Defendants' expert's declaration is insufficient to have shifted the burden to Plaintiffs to establish a triable issue of material fact. Although Defendants' expert provided testimony of certain "benefits" of both the open unguarded drive wheel and the top-mounted placement of the warning light, Defendants presented no evidence-from this expert or otherwise-of either the "risks" of those design features or other competing design possibilities. This is very similar to the situation in Gonzalez v. Autoliv ASP, Inc. (2007)
For these reasons, Defendants did not meet their burden of establishing that the risk-benefit test applies to defeat Plaintiffs' claims. Thus, the trial court erred in granting summary judgment based on the risk-benefit test.
D. We Do Not Consider, and Thus Do Not Express an Opinion on, the Evidentiary Issues Raised by the Parties
Plaintiffs and Defendants each filed objections to some of the evidence submitted by the other, and on appeal, both Plaintiffs and Defendants argue that the trial court erred in overruling their respective objections. However, the trial court never ruled on Plaintiffs' objections, and the court did not have jurisdiction at the time it ruled on Defendants' objections (see fn. 2, ante ). As a result, the record contains no evidentiary rulings that we can review on appeal. Accordingly, we must proceed as if the trial court had overruled both parties' evidentiary objections. ( Reid v. Google, Inc. (2010)
*564Because we have concluded that the trial court erred in granting summary judgment regardless of the admission of the allegedly objectionable evidence , any potential error in admitting the evidence was not prejudicial to Plaintiffs. Similarly, Defendants expressly recognize that they were not prejudiced by the trial court's rulings.
Accordingly, we do not consider-and thus do not express an opinion on-the merits of any of the evidentiary objections raised by the parties in this appeal.
DISPOSITION
The judgment is reversed, and the matter is remanded to the trial court with instructions to enter an order denying Defendants' motion for summary judgment, denying Defendants' motion for summary adjudication of Plaintiffs' claims for negligence and for defective design, and granting Defendants' motion for summary adjudication of Plaintiff's claims for defective manufacturing and for failure to warn. Kawika Demara and Sandra Demara are entitled to their costs on appeal from The Raymond Corporation and Raymond Handling Solutions, Inc.
WE CONCUR:
MCCONNELL, P.J.
HALLER, J.
We have viewed the video of the accident that is contained in the record on appeal.
The record contains no rulings on any of Plaintiffs' objections to the evidence submitted by Defendants. As for Defendants' objections to Plaintiffs' evidence, the order granting summary judgment refers to an "attached Order Re: Defendants' Objection to Evidence" and contains a separate "Order Re: Defendants' Objection to Evidence" filed on the same date. That document contains each defense objection and a space for the court to check "Sustained" or "Overruled" as to each objection, but contains no check mark or ruling as to any objection. The record contains an "Amended Order Re: Defendants' Objection to Evidence" filed almost three months later which contains rulings on Defendants' evidentiary objections. However, the court lacked jurisdiction to issue those rulings, because by that time Plaintiffs had already appealed from the judgment. (Code Civ. Proc., § 916, subd. (a) ; Varian Medical Systems, Inc. v. Delfino (2005)
Plaintiffs have confirmed their position in this appeal and raise no issues as to those summary adjudication rulings on appeal. Accordingly, we affirm the rulings related to any alleged manufacturing defect or failure to warn without expressing any opinion as to the merits of these rulings.
In other contexts, a product can also be defective in its manufacture or its failure to warn of known risks. (See Webb v. Special Electric Co., Inc. (2016)
Similarly, in a claim based on negligent design of a product, the trier of fact must balance the likelihood and gravity of potential harm from the design at issue against the burden of the measures required to avoid the harm. (Merrill, supra, 26 Cal.4th at pp. 479-480,
In their memorandum of points and authorities in support of their motion, Defendants did not separate their argument alleging a lack of causation from their argument alleging no defect.
In this context, an "ordinary consumer" is "a hypothetical reasonable consumer" of the product, not the particular plaintiff in a case. (Campbell, supra, 32 Cal.3d at p. 126, fn. 6,
Plaintiffs did not submit expert testimony in support of their argument that they could establish the existence (or at least a triable issue of material fact as to the existence) of a design defect under the consumer expectation test. Nor were they required to. Because the consumer expectation test is based on minimum safety that is within the knowledge of lay jurors, "expert witnesses may not be used to demonstrate what an ordinary consumer would or should expect." (Soule, supra, 8 Cal.4th at p. 567,
Notably, the plaintiffs did not present evidence from refinery workers (or from the decedent prior to his death) concerning their specific expectations on the safety of the asbestos insulation used. (Saller, supra, 187 Cal.App.4th at p. 1236, fn. 11,
